--Growing population resulted in growing rubbish. --There is possibility that rubbish _______

--Growing population resulted in growing rubbish. --There is possibility that rubbish ________the major threat to human beings.

#100097

becomes

is becoming

became

would become

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In addition to what ________ above, his speech was also involved in some big issues of our society.

#100773

mentioned

is mentioned

was mentioned

mentions

The discussion ________ alive when an interesting topic was brought in.

#104745

was coming

had come

has come

came

 I know Mr. Brown; we ______ to each other at an international conference.

#104101

are introduced

are been introduced

were introduced

had been introduced

The government has taken some measures to prevent more trees from _____.

#100712

cutting down

cut down.

being cut down

been cut down

--Can I call you back at two o’clock this afternoon? ---- I’m sorry , but then I ______ to Beijing . How about five ?

#100911

fly

will be flying

will fly

am flying

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