— There'ssomeone knocking on the door. Who _____it be?
— It must be Mary. She promised to be here at 8：00.
| A．must | B．need | C．shall | D．Can |
Every evening after dinner, _____ tired from work, I will spend some time reading.
| A．unless | B．if | C．until | D．when |
—Do you know _____ that Mr. White left the party without saying a word last night?
—Perhaps because he was angry with Alan’s rude remarks.
| A．why was it | B．how was it | C．how it was | D．why it was |
With so much noise outside, the students can’t _____ their homework.
| A．concentrate on | B．depend on | C．keep on | D．put their hands on |
The reporter has ever had a case ______ he got the wrong end of the stick.
| A．which | B．that | C．who | D．where |
Reporters are _______ to get all facts straight and present their stories fairly.
| A．believed | B．supposed | C．thought | D．considered |