—Why didn’t Tom go to the concert last night ? — I have no idea, but I think he _____ in his study.
| A．read | B．have read |
| C．was reading | D．would read |
It's ______ he helped you that I'm ready to help him.
| A．the reason | B．for | C．because | D．since |
______ you ever have any trouble, let me know.
| A．If | B．Whenever | C．While | D．X |
______, the library was closed.
| A．Sunday | B．Being Sunday | C．It to be Sunday | D．As it was Sunday |
Tom and Jack went ______ they could find work.
| A．every place | B．the city where | C．the place where | D．wherever |
He wrote his first novel ______ studying in a university.
| A．since | B．as | C．while | D．with |