用括号内所给动词的适当形式填空。

1．Mr．Wang        (teach) maths in the school a few years ago．

2．Keep quiet，please．The scientist        (give)a talk to the students of Grade Three in the meeting—room．

3．Her younger brother is too young        (go)to school

4．Mrs．Black stopped         (buy)some vegetables on his way home．

5．You shouldn’t play computer games until you finish         (write)your composition．

6．Lisa with her classmates          (have)to study for the math test．

7．一Could you please         (take)out the trash?

一No problem !

8．Mr．Brown often makes his son         (help)him           (clean)his car．

9．I live in a town        (call) Qufu．

10．I saw an old man         (walk)over just now．