Câu hỏi:

The earth is being threatened and the future looks bad.

A. done

B. made

C. protected

D. varied

Câu 1:

She must be very strong to carry such a weight on her back.

A. weak

B. musculous

C. sick

D. healthy

Câu 2:

She was always very hard-working at school.

A. studious

B. learned

C. lazy

D. attentive

Câu 3:

Certain courses are compulsory; others are optional.

A. voluntary

B. free

C. pressure

D. mandatory

Câu 4:

In the first two decades of its existence, the cinema developed rapidly.

A. leisurely

B. slowly

C. weakly

D. shortly

Câu 5:

I've put the cake on a high shelf where he can't get at it.

A. low

B. untouchable

C. far

D. difficult to reach

Câu 6:

Population growth rates vary among regions and even among countries within the same region.

A. fluctuate

B. stay unchanged

C. restrain

D. remain unstable