单项选择题 As it turned out to be a problem of no importance, we()so much time look- ing into it.

单项选择题 —Can I help you —I'd like to buy a present for my father's birthday,()at a proper price, but of great use.

单项选择题 —Dear me! Ive been in America for a month. —()you are settled, why dont you take up some serious study