Since the epidemic appeared last winter, it ______ about a hundred lives

Scientific researches show that to _________ alanguage one had better often get exposed to it.

_____ worries the doctor most was _______ they could find the cause of the disease.[ ]

Can I help you, sir?—Yes, please. Do you have any books on cooking?—There are only a few, ____.

Which do you enjoy____________ yourweekends, fishing or watching TV