It is in the big factory ______________my father works.

Boys, don’t lose____ in playing Angry Birds. It is bad for your eyes to play computer games for a long time.

Only those who have the patience to do simple things perfectly ever _________ the skill to do difficult things easily.

They’ve kept up a friendship with the teacher whom they were at school _____ twenty years ago

(2014·安徽马鞍山两校第二次联考)China is developing fast.That’s________I think those of my colleagues who deal with China affairs should visit China.