Câu hỏi: She had worked as a tourist guide before __________ a teaching career.

A. starting

B. start

C. to start

D. started

Câu 1: What _________ computer a miraculous device?

A. makes

B. make

C. making

D. to make

Câu 2: Braille _________ a system of raised dots that can be read with the fingers by people who are blind.

A. am

B. be

C. is

D. are

Câu 3: The weather was fine so we decided to go ____________ foot.

A. on

B. by

C. with

D. in

Câu 4: I prefer ___________ abroad to travelling within the country.

A. going

B. to go

C. go

D. went

Câu 5: Digital cameras is a wonderful ___________.

A. invent

B. invention

C. invented

D. inventing

Câu 6: Three women, none of whom we _______ before, _______ out of the hall.

A. saw-had come

B. had seen-came

C. saw-came

D. had seen-had come