21.You must keep your room ________.
A clean B cleaning C to clean
22.My parents ________ to Kunming. They left this morning and will return in a month.
A have been B went C have gone
23.Two months ________ quite long for me. I can't wait.
A is B are C wore
24.One day, I ________ some boys playing in that river.
A asked B saw C made
25.The policeman let the traffic ________ again.
A go B to go C going
26.I'm sorry she's out and she ________ back until 9:00.
A will come B come C won't be
27.Has Lucy forgotten ________?Yes, she has forgotten ________.
A somthing…something B anything…nothing C anything…something
28.There is ________ with Kate.
A anything wrong B wrong something C something wrong
29.The Great Green Wall stops the sand ________ towards the rich farmland in the south.
A not to move B without moving C from moving
30.—Let's go out for a walk, ________?
—All right.
A don't we B shall we C will you
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