You would become irritated if you watched the mail _____ on your desk every day.
A. putting up
B. to be put up
C. to pile up
D. pile up
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We shall get Jim ______ the passage.
A. explaining
B. explained
C. to explain
D. explain
In fact, she would rather leave for San Francisco______ in Los Angeles.
A. To stay
B. than stay
C. than staying
D. than have stayed
Madam Curie is believed ______ the radium.
A. discovering
B. having discovered
C. to discover
D. to have discovered
She ought not to _______ the house last year.
A. sell
B. has sold
C. be selling
D. have sold
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