.
I think I can fix your car tomorrow afternoon._________, you will have to wait till next Friday.
| A．If so | B．If not | C．If necessary | D．If possible |
His parents are convinced ____ the fact the their son always focuses his mind ___ his study.
| A．of; on | B．of; at | C．by; to | D．on; at |
The farmers built long fences, ____ keeping the wild dogs out of them.
| A．aimed at | B．aim for | C．aiming at | D．aimed to |
Mr Smith ______ a book about China last year but I don’t know whether he has finished it.
| A．has written | B．wrote | C．had written | D．was writing |
_____ I read the story, I’m greatly moved by it.
| A．At the moment | B．Every time | C．For the time | D．Next time |
He ran as fast as he could _____ to catch the early bus.
| A．to hope | B．hope | C．hoping | D．hoped |