1.He reads the texts every morning. ________ he is able to recite them.           

A. By this way                 B. In this way                 C. With this means                 D. In this method

2.By the time they arrived, the enemy forces _______, leaving the small village destroyed.           

A. withdraw                B. will withdraw                C. are withdrawing                D. had withdrawn

3.From the address________on the envelope£¬we see that the letter is from America.

A. marking                     B. marked                     C. to be marked                     D. having marked

4.The factory       its waste into the river, but now it deals with the waste in a new way.           

A. used to dump         B. is used to dump         C. used to dumping         D. is used to dumping