Câu hỏi: Sandstorms               .

A. do no harm to machinery 

B. have effects only on the eyes

C. never lasts more than one hour

D. have bad effects on both human beings and machinery

Câu 1: I wonder __________.

A. where he has gone

B. has he gone where

C. where has he gone

D. he has gone where

Câu 2: Rock Band

A. Complain about her son's friends 

B. Give advice to teenagers

C. Describe her son's hobby

D. Compare herself with her parents

Câu 3: The teacher told Jessey ____________.

A. stop talking

B. to stop talking

C. stops talking

D. stopped talking

Câu 4: Which is not a problem for an unprepared man in a hot desert?

A. Sandstorm

B. Loss of water

C. Irrigation 

D. Heatstroke

Câu 5: Not drinking enough water is a problem for ________.

A. coffee drinkers

B. doctors

C. officers

D. workers

Câu 6: I _________ my English a lot since the last seminar.

A. improved

B. improve

C. have improved

D. has improved