Câu hỏi: It isn’t quite ______ that he will be present at the meeting.

A. right

B. exact

C. certain

D. formal

Câu 1: He’s not ______ of learning German in six months.

A. interested

B. inclined

C. able

D. capable

Câu 2: The country has a system of ______, most of which date from the nineteenth century.

A. channels

B. rivers

C. streams

D. canals

Câu 3: If you put too many potatoes in that paper-bag it will ______.

A. explode

B. crack

C. burst

D. overcrowd

Câu 4: As there was a power cut in the hospital, the surgeon had to _____ the operation.

A. call for

B. call on

C. call off

D. call out

Câu 5: The bus ran over the cliff because its _______ failed.

A. brakes

B. controls

C. gears

D. signals

Câu 6: Every day thousands of ______ fly the Atlantic for negotiations with American firms.

A. merchants

B. dealers

C. businessmen

D. tradesmen