`31`. A small fish needs camouflage to hide itself so that its enemies cannot find it.
A. cover  B. beautify C.showD. locat

hide: giấu

show: biểu lộ
The opposite of hide is show, which means to make visible or reveal.

`32`. Solar energy doesn't cause pollution, but it is not cheap.
A.expensiveB. effective C. commercial D. possible
cheap: rẻ

expensive: đắt
The opposite of cheap is expensive, which means costing a lot of money or more than expected.

`***` Tìm từ trái nghĩa:

`31. C`. show

`-` hide >< show: ẩn >< hiện

`32. A`. expensive

`-` cheap >< expensive: rẻ >< đắt