The professor asked a question, and David ________ a good answer.
Although Tom is satisfied with his academic achievement，he wonders _______ will happen to his family life .
A trend that occurs at the same time with the movement to the South and the Weast of the United States is ________.
The origin of the American party system can be traced to ________.
Two-thirds of his property_____lost in the fire.
下面所述小儿的总热量中哪项所需热量是小儿最特殊的（）
Britain has, for centuries, been slowly tilting with ________.
蓝光灯照射不正确的方法是（）
She has no hostility to us, _____can be judged from her eyes。
The longest river in Canada is ________.