If it ________ (rain) tomorrow, we won't go picnic.

Children need ________ (have) at least 8 hours' sleep every night.

I'm really amazed at what I've seen in Hangzhou, so ________ (be) my classmates.

According to me, ________ (put) up signs is a good way.

Every year, lots of clothes will be given away to children who ________ (do) have enough money to buy them.

By the time I left the park, I realized I ________ (take) any photos there.

Tea ________ (bring) to the Western world until 1610.

In foreign countries, the bike is often used for ________ (do) exercises.

The TV ________ (invent) before the calculator and after the car.

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