He was very happy because he met an old friend of his on the road .A、by accident B、by mistake C、by hand
—I didn’t hear you come in at noon. —That’s good. We tried _______ any noise. We wanted you to have a good sleep.
We should do everything we can _______ the birds _______ danger.
At first, Luke felt a sense of cold _______ his body. A cross B. across C. through D. by
I spent _______ awful holiday this summer because _______ big flood on July 30th made lots of people lose lives.
If the earthquake happens, you should run _______ the empty ground.