-This is a gas station! And you know smoking is forbidden here.-Oh, terribly sorry.
By the time my mother came back from work, my sister and I ________ supper and were waiting for her at the table.
As is reported, it is 100 years______Qinghua University was founded.
He had his camera ready____ he saw something that would make a good picture.
They were busy ________ an experiment when I came.
“Harry Potter” is said ______ into over twelve languages by the end of last year.