It is generally believed that constant reading andcomprehending can ______ our mental ability of comprehension while physicalexercise can help build up our body.

____—Sorry. She isn’tat home now.

he talks a lot about his favoritesingers after class

They _______ the train until it disappeared (消失) in the distance (在远处).

33. — How can you be late for such an important conference? — Sorry! But my flight was ______ by fog.