1. My sister enjoys singing and ____ favorite subject is music.
A. his B. her C. your D. their
2. It's a good idea to visit Beijing ____ October.
A. at B. on C. in D. to
3. — Must I stay here and wait for you?
— No, you ____. You can go home now.
A. needn't B. can't C. mustn't D. shouldn't
4. — Which do you like ____, swimming or skating?
— Swimming.
A. well B. better C. best D. the best
5. — ____ do you tidy your own room?
— Twice a week.
A. How often B. How soon C. How much D. How long
6. It was difficult to climb the mountain, ____ Sam got to the top at last.
A. or B. so C. for D. but
7. — Lucy, what are you doing?
— I ____ a model ship.
A. make B. made C. am making D. was making
8. The Shenzhou-15 astronauts ____ to Earth safely on June 4, 2023.
A. return B. returned C. will return D. have returned
9. If you go to the concert with us tomorrow, you ____ a great time there.
A. have B. had C. will have D. have had
10. Eric ____ many things since he became interested in science.
A. is learning B. was learning C. will learn D. has learned
11. The park is getting more and more beautiful because more kinds of flowers ____ every year.
A. are planted B. were planted C. plant D. planted
12. — Lily, can you tell me ______ during the Dragon Boat festival this year?
— Sure. We ate zongzi and watched a dragon boat race.
A. what you will do B. what you did
C. what will you do D. what did you do
答案及解析：
1. 句子的主语是“My sister”，为女性，这里表示“她最喜欢的学科”，要用形容词性物主代词her，所以选B。
2. 在月份前用介词in，“in October”表示“在十月”;at用于具体时刻前;on用于具体日期、星期几等前;to通常表示方向等，所以选C。
3. 以“Must I...”开头的一般疑问句，否定回答用“No, you needn't.”或“No, you don't have to.”，意思是“不，你不必”，所以选A。
4. 两者(swimming和skating)进行比较，要用比较级，well的比较级是better，所以选B。
5. 根据答语“Twice a week.”(一周两次)可知，问句是对频率提问，用“How often”;How soon对将来时间提问;How much对数量或价格提问;How long对时间段或长度提问，所以选A。
6. 前半句说“爬山很难”，后半句说“Sam最终到达了山顶”，前后是转折关系，用but连接，所以选D。
7. 根据问句“Lucy, what are you doing?”可知，答语要用现在进行时，其结构是“be + 动词的现在分词”，所以选C。
8. 根据“on June 4, 2023”可知，句子时态是一般过去时，动词要用过去式，return的过去式是returned，所以选B。
9. if引导的条件状语从句，遵循“主将从现”原则，从句“If you go to the concert with us tomorrow”是一般现在时表将来，主句要用一般将来时，其结构是“will + 动词原形”，所以选C。
10. 根据“since he became interested in science”可知，句子要用现在完成时，其结构是“have/has + 过去分词”，Eric是第三人称单数，用has learned，所以选D。
11. 根据“every year”可知，句子时态是一般现在时，主语“more kinds of flowers”和“plant”之间是被动关系，要用一般现在时的被动语态，其结构是“am/is/are + 过去分词”，所以选A。
12. tell sb. sth.结构中，sth.是宾语从句，要用陈述语序，排除C、D;根据答语“We ate zongzi and watched a dragon boat race.”可知，动作发生在过去，要用一般过去时，所以选B。
