My sister enjoys _________ (play/playing) the guitar in her free time.Answer: playingExplanation: Use the gerund form "playing" after "enjoys."（在“enjoys”后面使用现在分词形式“playing”。
）The house next door needs _________ (paint/painting).Answer: paintingExplanation: Use the gerund form "painting" after "needs."（在“needs”后面使用现在分词形式“painting”。
）I'm not sure _________ (whose/who's) coat this is.Answer: whoseExplanation: Use "whose" to show possession, not the contraction "who's" which means "who is."（使用“whose”表示所有权，而不是缩写形式“who's”，后者表示“who is”。
）The cat is hiding _________ (underneath/under) the bed.Answer: underExplanation: Use "under" to show the position of the cat in relation to the bed.（使用“under”表示猫相对于床的位置。
）I need to go to the store to buy _________ (some/any) milk.Answer: someExplanation: Use "some" to show a specific quantity of milk needed.（使用“some”表示需要一定数量的牛奶。
）She told me _________ (her/she) name.Answer: herExplanation: Use the object pronoun "her" because it is the object of the verb "told."（使用宾格代词“her”，因为它是动词“told”的宾语。
）The book _________ (that/which) I borrowed from the library is overdue.Answer: thatExplanation: Use "that" to introduce a restrictive clause which defines which book is being referred to.（使用“that”引导一个限制性从句，定义正在讨论的书。
）My grandparents have been married for _________ (sixty/sixtyth) years.Answer: sixtyExplanation: Use the word "sixty" to show the number of years.（使用“sixty”表示年数。
）The doctor advised me _________ (to take/taking) some time off work.Answer: to takeExplanation: Use the infinitive form "to take" after "advised me."（在“advised me”之后使用不定式形式“to take”。
）They couldn't decide _________ (whose/who's) turn it was to do the dishes.Answer: whoseExplanation: Use "whose" to show possession, not the contraction "who's" which means "who is."（使用“whose”表示所有权，而不是缩写形式“who's”，后者表示“who is”。
）The movie we watched last night was really __________ (entertain/entertaining).Answer: entertainingExplanation: Use the -ing form "entertaining" to describe the movie.（使用-ing 形式"entertaining" 来形容这部电影。
）It's important to _________ (exercise/exercising) regularly to stay healthy.Answer: exerciseExplanation: Use the base form "exercise" after "to" to show purpose.（在“to”后面使用基本形式“exercise”，表示目的。
）The teacher gave us _________ (each/one) a worksheet to complete.Answer: eachExplanation: Use "each" to show that every person received a worksheet.（使用“each”表示每个人都得到了一份工作表。
）I'm not used to _________ (get/getting) up early on the weekends.Answer: gettingExplanation: Use the -ing form "getting" after "used to."（在“used to”后面使用-ing 形式“getting”。
）She is _________ (farther/further) ahead in her studies than I am.Answer: fartherExplanation: Use "farther" to describe physical distance or degree of separation.（使用“farther”来描述物理距离或分离程度。
）The weather is perfect for _________ (flying/fly) a kite.Answer: flyingExplanation: Use the -ing form "flying" after "for" to show purpose.（在“for”后面使用-ing 形式“flying”，表示目的。
）My sister is always _________ (borrowing/lending) my clothes without asking.Answer: borrowingExplanation: Use "borrowing" to show that she is taking the clothes without permission.（使用“borrowing”表示她没有得到许可就拿了这些衣服。
）She is one of the _________ (best/better) athletes on the team.Answer: bestExplanation: Use the superlative form "best" to describe the athlete.（使用最高级形式“best”来形容这位运动员。
）I need to _________ (buy/buying) a new computer because my old one is broken.Answer: buyExplanation: Use the base form "buy" after "need to" to show necessity.（在“need to”后面使用基本形式“buy”，表示必要性。
）The teacher asked us to _________ (write/writing) an essay about our summer vacation. Answer: writeExplanation: Use the base form "write" after "asked us to" to show the task assigned.（在“asked us to”后面使用基本形式“write”，表示分配的任务。
）I can't believe how __________ (fast/fastly) she runs.Answer: fastExplanation: Use the adjective "fast" to describe the speed of her running.（使用形容词“fast”来描述她的奔跑速度。
）The _________ (furthermore/moreover) we waited, the more impatient we became.Answer: moreverExplanation: Use "moreover" to add another point or idea.（使用“moreover”来添加另一个点或想法。