1.  The manager is going on business next week and the company will be left ______Mike.  

A. in charge of             B. in the charge of

C. taking charge of          D. taking the charge of

2.     Professor Wang entered the classroom, _________ a group of students.

A. following with     B. followed with     C. followed by  D. following by

3.     _________ we have finished the course, we shall start doing more revision work.

A. For              B. Now that          C. Ever since        D. By now