There serious air pollution if people use more and more cars.

 There      serious air pollution if people use more and more cars.

#36558

has

will be

will have

are going to be

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John       to London to watch the Olympic Games next week.

#40658

flies

flew

will fly

has flown

 一Have you mended your bike，Bob?一Yes，I______it twenty minutes ago.

#36854

have mended

mend

had mended

mended

We’ll go camping if it ________ tomorrow.

#37930

won’t rain

doesn’t rain

didn’t rain

isn’t raining

I _______ the book for two weeks. I must return it to the school library.

#41731

borrow

have borrowed

kept

have kept

If the homework _______, you can go home.

#37038

did

has done

will be done

is done

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