Câu hỏi: Chewing gum ………… in Sweden in 1993.

A. was invented

B. is invented

C. has been invented

D. invented

Câu 1: I don’t think life ……. better in the future.

A. won’t 

B. will be

C. be

D. is

Câu 2: ……… I was a child, I used to play football.

A. As soon as

B. While

C. When

D. If

Câu 3: She does not know what to do when her parents …….. a complaint to her.

A. make

B. give

C. keep

D. tell

Câu 4:  I’ll phone you ……………….. I come.

A. while

B. until

C. as soon as

D. because

Câu 5: I hate …. ….the washing up.

A. taking

B. doing

C. getting

D. making

Câu 6:  They found it is impossible ……… their problems.

A. solve

B. to solve

C. solved

D. solving