Câu hỏi: Helen had said goodbye to everybody in the class _____ she left for the hometown.

A. after

B. before

C. and

D. for

Câu 1: This book is based _____ part on fact.

A. in

B. upon

C. at

D. on

Câu 2: The government is trying to make the country safe _____ terrorist attacks.

A. from

B. of

C. at

D. for

Câu 3: They came to visit us _____ my birthday.

A. at

B. on

C. to

D. of

Câu 4: They prevented me______ entering the house.

A. from

B. on

C. with

D. at

Câu 5: Mrs. Liz was accused _______ having stolen the car.

A. of

B. with

C. in

D. upon

Câu 6: John F. Kenedy was the first President to be born ____ the twentieth century.

A. in

B. on

C. at

D. up