.They were all so tired that they could ______.
When the students were playing games on the playground, Jim suddenly stopped ______and began to cry, so we stopped _______ what was wrong with him.
---- You should be _______ careful when you take the chemistry exam. ---- I agree. In this way, I will make _______ mistakes.
Tom is weak in physics. He always feels _______ before he takes a physics test.
---- There is _______ interesting book on the teacher’s desk. ---- Oh, ______ book is Wei Fang’s.
—Where are you? I can’t see you in the hall. —______. I’m just one block away.