1.mary often exercises and she is quite well.

1.mary often exercises and she is quite well.
本句中的exercises 为什么要加s呢?
2.You hardly know him,-----?
A.are you B.aren't you C.do you D.don't you
（解释下意思和选择的原因）
3.sometime、sometimes、some time的区别
4.------in the class like playing the game.
A.Most us B.most of students
C.Most of the boys D.Most student
(解释下用法区别）
5.You sister is too young.You should look after her ------.
A.good B.nice
C.fine D.well
6.She ------- the book two years ago.
A .read B.reads C.readed D.red
7.will it rain tomorrow?
A.I think so B.I think it C.I don't think it D.I think not
8.He finished ------his bedroom.
A.cleans B.clean C.cleaning D.to clean
9.Did you finish reading the novel
句中read为什么要加ING?
10.I don't think think there is ---.
A.something serious
B.nothing serious
C.anything serious
D.serious anying
11.He spent one day ------with his friends.
A.play B.playing C.to play D .plays
12.They will finish -----in ten minutes.
A.talk B.to talk
C.talking D.talks
希望回答的朋友可以帮我比较一下可选项的区别等