几道英语时态的题， 麻烦把答案和解释都写出来， 谢谢

2. Mary ___A__ on shoes when she ____ them.(第三人称单数）
A. tries…buys B. tries… buies C. trys… buys D. trys… buies
3. The girl often ____B__ cold when she ______.（以ch结尾单数加es）
A. cathcs…dances B. catches… dances
C. catchs…dancees D. catches… dancee,
4. ____D_ he ____ himself there? No, I don't think so. 第三人称用助动词does,助动词后用动词原形
A. Do…enjoy B. Does… enjoies
C. Does… enjoys D. Does…enjoy
5. _B__ your teacher ____ from them very often? Certainly.收信用hear from第三人称用助动词does,助动词后用动词原形

A. Do…hear B. Does…hear C. Do… receive D. receive
6. ____C_ your mother _____ some cleaning on Sundays?your mother 为第三人称第三人称用助动词does,助动词后用动词原形
A. Does…does B. Do…does C. Does…do D. Do… do
7. ___D__ Tom _____to work hard to help his family ? Yes, he _____.第三人称用助动词does,助动词后用动词原形
A. Has… x…does B. Has…x…does
C. Does…has…has D. Does… have…does
8. Which teacher _B____ lessons to you every day ?第三人称用助动词does,助动词后用动词原形
A. does …gives B. does… give C. do… give D. gives
9. Smith does not go fishing on weekdays, _D___? _____ , he does.
A. does he…No B. does he…Yes
C. doesn’t he…No D. doesn’t he…Yes
10.Mr Black often ___A__ fishing on Sundays, _____ he ?第三人称用单数go加es，前面否定，后面肯定
A. goes…doesn’t B. goes…isn’t
C. doesn’t go…does D. doesn’t go…is

2. Mary __A_ on shoes when she ____ them.
A. tries…buys B. tries… buies C. trys… buys D. trys… buies
3. The girl often ___B___ cold when she ______.
A. cathcs…dances B. catches… dances
C. catchs…dancees D. catches… dancee,
4. __D___ he ____ himself there? No, I don't think so.
A. Do…enjoy B. Does… enjoies
C. Does… enjoys D. Does…enjoy
5. __B___ your teacher ____ from them very often? Certainly.
A. Do…hear B. Does…hear C. Do… receive D. receive
6. ___C__ your mother _____ some cleaning on Sundays?
A. Does…does B. Do…does C. Does…do D. Do… do
7. ___D__ Tom _____to work hard to help his family ? Yes, he _____.
A. Has… x…does B. Has…x…does
C. Does…has…has D. Does… have…does
8. Which teacher __D___ lessons to you every day ?
A. does …gives B. does… give C. do… give D. gives
9. Smith does not go fishing on weekdays, __B__? _____ , he does.
A. does he…No B. does he…Yes
C. doesn’t he…No D. doesn’t he…Yes
10.Mr Black often ___A__ fishing on Sundays, _____ he ?
A. goes…doesn’t B. goes…isn’t
C. doesn’t go…does D. doesn’t go…is

几年级的 啊
？？？？ ？