I ______ sooner but I didn’ t know that they were waiting for me.
A. had come B. was coming C. would come D. would have come
I often the words I don’ t know in the dictionary or on the Internet.
A. look up B. look at C. look for D. look into
_________ is known to us all is that the 2012 Olympic Games will take place in London.
A．As B．What C．That D．It
Mr. Stevenson is great to work for—I really couldn’ t ask for a _______ boss.
A. better B. good C. best D. still better
He made another wonderful discovery, ______ of great importance to science.
A. which I think is B. which I think it is
C. which I think D.I think which is
Was it because of the heavy snowstorm in Europe _______ the flight had to be put off ?
A. which B．so C．why D．that
