What are you doing _____ vacation?

–How long has Mr. Liu taught English?     --- _______ 1998.     

.It took them half an hour to go           the crowd.

－When was David born?
－He was born ________ June 12, 1989.

— You look happy today.
— Yes, the news says the poor children can go to school again ______ the help of Project
Hope.

I often go swimming with my father______Sunday.

Betty is in front of me,so I am ________Betty.

His family took him______Europe and he gave concerts.

Gao Yan is__________ Zhao Fen and Li Min.

—What’s this __________ English?
—A pen.