Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.
He looked around and caught a man _____ his hand into the pocket of a passenger.
Don’t leave the water ____ while you brush your teeth.
_____ and out of breath, we reached the top of the mountain and stopped _____ the beautiful scenery.
I don’t know whether you happen ____ it, but I’m going to study in the U.S.A. this September. A. to be heard B. to be hearing C. to hear D. to have heard
“Do you have anything more ______, sir?” “No. You can have a restordo something else.”