Look! Many people __________the buses at the bus stop.

Which module is the most difficult in this book?— I think _____ module.

“______,” the soldier screamed loudly, who held a gun in his hands, “or I will shoot again!”

Have you seen Mr. Smith?—Yes. Look, he _________with a parent in the office.

Learning English seems easy _______, but it is not really easy if you want to learn it well.[ ]