If you feel tired, you may stop.

Last year, I visited a chemical factory in Baise, there are about _____ workers in it.

Do you like your maths teacher? —Sure, because he is the teacher ___ helps me a lot.

What should we do now,Mr Clark?-Please turn to Page____and look at the____picture.

It’s getting dark, but Mr. Johnson is still at his office. —No surprise. Who else can ______ he does?