(   ) 1. I went to bed after I ________ my homework.

       A. finish doing  B. finished doing  C. finished to do  D. finished do

(   ) 2. I think maths is not ________ science.

A. so easy as    B. more easy than       C. easier        D. as easier as

(   )3. There are 12 people but only 10 seats. Would you please ask for _________ chairs?

A. some two     B. more two       C. two more      D. two another 

(   ) 4. Helen told me that she had some problems _______ his English.

A. on           B. for            C. in           D. with