Children should _________ not to talk with strangers.

The Vietnamese government has done a lot to ____ hunger and poverty.

Money is used __________ buying and selling goods.

Mark the letter A, B, C or D on your sheet to indicate the underlined part that needs correction in each of the following questions.

Because (A) much species of plants and animals(B)  in Hawaii are threaten (C) with extinction within a short period of time, scientists (D) are trying desperately to rescue them.

The electric failed while she ……..dinner.

You should always do your best to get along ………….other people.

Mark the letter A, B, C or D on your sheet to indicate the underlined part that needs correction in each of the following questions.

Hadn't he (B) resigned, we would have (C) been forced (D) to sack him.

A: I think it is a good idea to have three or four generations living under one roof. B: ______ There are many differences between generations.