選出能替換句子中畫線部分的選項。
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