I would appreciate back this afternoon.
A. you to call B. you call C. your calling D. you’re calling
If something ________, it becomes less and less and eventually disappears completely.
A. dies off B. breaks off C. dies out D. breaks out
It’s the first time ______ he has helped us.
A. that B. before C. when D. who
Here are two pairs of shoes, ______ you may choose.
A. both of them B. either of them C. any of which D. either of which
He plays well or badly according to his mood (����), so he's a very _________ player.
A. modest B. easygoing C. temperamental D. calm
No one knows exactly ______ this important discovery was made.
A. that B. that how C. what D. when
