In a position like this, one can ________ stand up _______ lie down . So it is very uncomfortable.
Pollution is a serious problem. Scientists will _______ some good ways to save it.
My father often cooks some delicious food _________for us at home.
— What did you see? — I saw many boys________ games near the river.
— What’s the trouble with you? 一I________ a headache.
Students shouldn’t go to school __________breakfast. It’s bad for their health.