The students    how to do the experiment in class yesterday.

Every year lots of trees _______ to make our country more beautiful.

It          to drive after drinking wine.
A. is allowed     B. is not allowed  C is made        .   D is welcomed

—Excuse me, what’s this for?
—It’s a cleaner and it       to pick up dirt.

At least 300 million people are using QQ _________ by Ma Huateng to chat on line．

If the question_________ incorrectly,_________question will be given to you.

We can raise more money for the disaster area Yu Shu if the clothes here            well.

Bikes ______ in the 1880s and they ______ traveling around.

--- It’s difficult for the village children to cross the river for school.
--- I think a bridge ________ over the river.

---There’s too much salt in the Chinese diet.
---So there is. The WHO says only 1.5 grams of salt __________ for each man every day.