--Growing population resulted in growing rubbish. --There is possibility that rubbish ________the major threat to human beings.
#100097
A
becomes
B
is becoming
C
became
D
would become
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My mother _____ all the cleaning for my family, but recently she has been too busy teaching to do it.
#99234
A
will do
B
is doing
C
does
D
had done
---Did you enjoy staying with your good friend last week,Lily?---Yes, I______ with him for a long time.
#102617
A
haven’t stayed
B
didn’t stay
C
wouldn’t stay
D
hadn’t stayed
Tom killed the cat. I’ll ask him why _______.
#101009
A
he did that
B
did he do that
C
he does that
D
he had done so
By the time he arrives in Beijing, we ______ here for two days.
#100865
A
will have stayed
B
will be staying
C
have been staying
D
have stayed
—Alice, you have won the first place! —Pardon? I ______ I would fail the exam this time.
#99226
A
think
B
thought
C
have thought
D
am thinking