If unsolved, the problem of food safety may lead to more serious results.

 If       unsolved, the problem of food safety may lead to more serious results.

#80315

having left

to leave

left

leaving

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(2014·湖南郴州五校第二次联考)Not only________to turn off the lights in the kitchen，but we also failed to lock the front door.

#79564

we forgot　

forgot we

did we forget　

we did forget

—He should have been punished for the serious mistake.— ________, but he escaped it.

#82807

So should he

So he was

So he should

So he has

Only in this way _________ find him.

#82930

we may

we must

we can

can we

_______ that it was already the fourth time that he _______ abroad.

#81615

So lucky he was; traveled

So lucky was he; traveled

So lucky he was; had traveled

So lucky was he; had traveled

Though ________ money, his parents managed to send him to school.

#80361

lacked

lackingof

lackof

lacking

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