uch heavy traffic in big cities, drivers have to be specially cautious over their driving circumstances so as not to _______ each other’s cars

Plenty of foreign firms have _____ factories here.

Bob! Don’t play basketball in the classroom.— Sorry, I________.

Can you work out the problem?—I can’t ______your explain how to do it

It seemed that our nursery rhymes___ some magic because all the nights I sang them for my daughter, she would listen to them with keen pleasure．