Choose the best answer for each of the following sentences.

We should do something to protect water from being polluted ………… we will have nothing to drink in the future.

Choose the best answer for each of the following sentences.

If I ……… my wallet at home this morning, I ……… money for lunch now.

Choose the best answer for each of the following sentences.

But for our parents, we ………………… successful in life.

Choose the best answer for each of the following sentences.

The campfire ………………… if it ………………… last night.

Choose the best answer for each of the following sentences.

…………… have enough apples, she’ll make an apple pie this afternoon.

Choose the best answer for each of the following sentences.

I will never talk to you again …… you apologize me ……… your being rude

Choose the best answer for each of the following sentences.

………………… you work harder, you will be sacked.

Choose the best answer for each of the following sentences.

It is too bad, Lam isn’t here. If he ……… here, he ………… what to do.

Choose the best answer for each of the following sentences.

If you ………………… to me, you wouldn’t have got so much trouble.

Choose the best answer for each of the following sentences.

If we …….. the plans carefully, we would not have had so many serious mistakes.

Choose the best answer for each of the following sentences.

If you don’t know how to spell a word, you ……… look it up in the dictionary.

Choose the best answer for each of the following sentences.

If you take the ice out of the fridge, it …………………

Choose the best answer for each of the following sentences.

If the sun …………………, we ………………… for a walk.

Choose the best answer for each of the following sentences.

Let’s knock on their door to see ……… home.

Choose the best answer for each of the following sentences.

I think you should stop smoking.