—What ______ when the earthquake happened on May 12th ?—Er, I was having a geography class in the classroom. A. are you doing B. did you do C. were you doing D will you do
English now is also spoken as _______ foreign or second language in _______ South Asia.
I will help you ________ I don’t sleep for a night.
He devoted his whole life ________ animals in danger.
John broke his old radio ________, wishing to get a new one for Christmas.
Now a lot of new technology can _____ problems in industry.