His father has worked in this factory _____ he came here in 1980.A. since B. for C. when
His father encourages him________up math.
—I’d like you to tell me something about Shennongjia.—I’m sorry,but neither Jack nor I________there.
Hello,everyone.This is our new classmate.Let her introduce________to you.
He gave________dollars to charities.
It is her dream________a famous singer.