More and more people have come to realize that if we had taken effective measures much earlier, the air quality _____

More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.

#86958

is not polluted

would not be polluted

had not been polluted

would not have been polluted

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Without electricity human life __________ quite different today.

#87677

will be

would have been

would be

It was lucky that little Jack was not at home when the fire broke out；otherwise，he his life．

#87644

had lost

would lose

would have lost

might lose

       I’ve been working all day, but I feel as if I _______ nothing.

#88119

have been achieved

were achieving

had achieved

am achieving

The door_________. Better have it repaired .

#89303

isn’t shut

hasn’t been shut

won’t be shut

won’t shut

What a pity! Considering his ability and experience, he ___________ it better.

#87501

need have done

must have done

can have done

might have done

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