All possible means ___ been tried to stop the air_____

All possible means ___ been tried to stop the air______.

#103381

has, polluted

have, polluting

have, being polluted

has, being polluted

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. At that time she ___ sit here like that for hours.

#103655

will

would

had to

shall

—How time flies. A little boy turns into a young man.—Yes, it won’t be long          he          from university.

#102482

when, will graduate

after, graduates

since, had graduated

before, graduates

--- You've left the light on.　 --- Oh , so I have.  _____and turn it off.

#101694

I've gone

I'll go

I go

I'm going

She made one or two remarks which suggested that the company _____in financial trouble.

#103637

was

should be

—— Where ＿＿＿＿＿? —— I got stuck in the heavy traffic.I ＿＿＿＿＿ here earlier.

#104633

did you go； had arrived

have you been； would have been

were you； would come

are you； was

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