--- Listen! David is talking happily with his mother in the next room.
--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.
| A．should | B．must | C．can’t | D．mustn’t |
The doctor _______ on the man and _______ saved his life.
| A．did a operation; / | B．did an operation; was |
| C．operated; / | D．operated; was |
Students can’t be made ____________ all day.
| A．study | B．to study |
| C．studying | D．of study |
You know great changes _____________ in our school in the past ten years.
| A．have been taken place | B．took place |
| C．have taken place | D．were taken place |
Paul doesn’t know _________ about his problems.
| A．how to talk to | B．who to talk |
| C．where to talk to | D．who to talk to |
--Who _______ the Harry Potter series________ ? -- J.K.Rowling.
| A．did, be written | B．was, written |
| C．was, written by | D．did, be written by |