I don’t think John saw me; he _____ into space.
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
_____ and out of breath, we reached the top of the mountain and stopped _____ the beautiful scenery.
_____ in thought completely, he didn’t even know what was going on.
The manager introduced the rules that she would like to see _______ the next year.
________ ,Mom had a cup of coffee and a few minutes’ rest.