— It _______ be Mr．Johnson who is in the office．
— No, it _______ be him．I saw him off at the airport half an hour ago．
| A．can’t ; can’t | B．must; can’t | C．must; mustn’t | D．may; mustn’t |
I get the two of them mixed up; they are so similar.
| A．at one time | B．at no time | C．in no time | D．all the time |
It is said that people arelikely to tell lies over the phone as they are in emails.
| A．as twice | B．twice as | C．twice more | D．twice than |
Our bad living habits will destroy the earth. Only by changingwe live can we save the earth．
| A．that | B．what | C．how | D．where |
His suggestion made me angry, but.
| A．making others happy | B．to make others happy |
| C．with others happy | D．others happy |
With her eyesthe work attentively, she didn't know what was happening outside.
| A．fixed on | B．focused | C．fixing on | D．focusing |