昨天晚上我妈妈很快就睡着了。
My mother________ ________soon last night．
（2014广东）Most people are________building a paper factory near here．They are worried the river will get polluted．
A．for
B．with
C．against
D．beyond
Yesterday evening I was playing the piano________the doorbell rang．
A．when
B．before
C．while
Tony________TV when his mother came in．
A．watch
B．watches
C．was watching
D．is watching
（2013天津）I saw him in the library yesterday．He________a book at that moment．
A．reads
B．is reading
C．was reading
D．will read
（2014北京）—What were you doing when we were playing basketball yesterday afternoon?
—I________the classroom．
A．was cleaning
B．have cleaned
C．will clean
D．clean
