If a thing is worth ______, it must be well ______.
| A．doing; done | B．to do; doing | C．to do; done | D．being done; doing |
—Oh, I failed again
—Don’t lose heart. One more time, ________ you will succeed.
| A．so that | B．therefore | C．however | D．and |
Mary does every single bit of housework ______her husband Bob just does the dishes at times.
| A．since | B．while | C．when | D．as |
Tom enjoyed himself so much _____ he visited his best friend in Beijing last year.
A. that B which C. when D.where
______ I accept that she is not a perfect girl, I do actually like her.
| A．While | B．Since | C．Before | D．Unless |
____ to America, her parents have not heard from her.
| A．Because she went | B．After she went | C．When she went | D．Since she went |