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Don’t disturb me. I _____ letters all morning and have written ten so far.
A.write
B.have written
C.was writing
D.have been writing

3、The world’s supplies of copper _____.
A.have gradually being exhausted
B.has been gradually exhausted
C.are gradually exhausted
D.are being gradually exhausted

4、Tom _____ since he lost his job three weeks ago.
A.has employed
B.was unemployed
C.had been unemployed
D.has been unemployed

5、Every possible test _____ to decide the nature of her illness.
A.carries out
B.carried out
C.was carried out
D.has carried out

6、I feel it’s an honor _____ to attend the opening ceremony of the new bank.
A.to invite
B.of being invited
C.to be invited
D.having invited

7、When Mr. Smith failed _____ us, we left without him.
A.to meet
B.to be meet
C.not to meet
D.not to

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