. It has been laid down that each student must _____ a composition to the teacher once a week.
| A．turn in | B．give up | C．put forward | D．bring out |
I really don’t know how to thank you , but for your help, I ______ my lost necklace．
| A．couldn’t have found | B．mustn’t have found |
| C．couldn’t find | D．wouldn’t find |
I don’t think his daughter is able to mend a computer, ________?
| A．does he | B．isn’t she | C．doesn’t he | D．is she |
__________ is often the case with her, my mother talked about my study for at least half an hour nonstop before she drove me to school yesterday．
| A．As | B．Which | C．What | D．That |
The girl had hardly rung the bell __________ the door was opened suddenly, and a birthday party was waiting for her．
| A．until | B．since | C．when | D．after |
It hit me _________ my mother could be the proper person to persuade Dad to change his mind．
| A．which | B．what | C．that | D．if |