选出能替换句子中画线部分的选项。

1 ．All of the students have studied very hard ．

A ．have worked    

B ．has worked

C ．have learned

D ．has done

2 ．We have learned a lot of things in the country ．

A ．a lot    

B.lots of

C ．a great number of    

D.a number of

3 ．What do you go there for?

A ．How    

B.    Why

C ．Whose  

D.   When

4 ．I'm never late for school ．  

A ．early    

B ．always early

C ．much better

D ．much fine

5 ．I do well in mathematics.

A ．am good in    

B ．am good at

C ．do best

D ．do my best