Tom ______ close the window when his attention was caught by a bird

Yunnan province in China was attacked by such a terrible drought this early spring ____________few people had experienced before, ____________ made us worry about global climate changes

.Our chemistry teacher announced that he would do the experiment in a different waywe might find interesting

He has _______ smoking because of his lung cancer. [ ]

If you want your children to be independent, put some responsibilities ______ their shoulders.[ ]