Loài người biết dùng các loại đèn điện chiếu sáng từ:

A. 1879

B. 1939

C. 1993

D. 1897

Choose the letter A, B, C or D to complete the sentences

You don’t have __________ tips for the waiters in Vietnam.

A. leave

B. leaving

C. to leave

D. left

John asked me____________that film the night before.

A. if had I seen

B. if I had seen

C. had I seen

D. that I saw