【2013黑龙江绥化】My uncle ________ books in the room at this time yesterday.A. was seeingB. is readingC. was reading
_______ Peter is old and weak, he still has to work.
The windows must _________ before you leave the room.
I am very sad that I ______ many chances in the last few years.
—Must we clean the classroom now? —No ,you _______.
—____________? —Very well, thanks.