1.because, as , since 引导原因状语从句。

29.I looked out of the window and saw that people were in a hurry to remove the snow.

26.Snow continued to fall around us.

★27.We lost our umbrella in the wind and I nearly fell over.

★★28.We could do nothing but walk slowly in the storm.

24.There was a heavy storm with thunder and lightning.

★25.Her school caught fire because lightning hit it.

23.I know that bad weather can be dangerous.

　 Bad weather sometimes causes natural disasters.

17.It took me longer to get to school.

★18.Everybody had to hurry since there would be no buses in two hours.

★★19.Mr Wu told us to go home. / Mr Wu asked Simon to close the windows.

　Simon advised Daniel to wear a raincoat./ Mr Wu warned us not to run.

　He told us to walk out of the classroom one by one. / Mr Wu ordered Simon to close the windows.

★20.The snow covers the whole place. = The whole place is covered with the snow.

★21.A man named Su Ning called the 110 hotline at 7:40p.m. using his mobile phone.

★22.Mr Su felt cold and frightened but he was not hurt.

15.It sounded like bombs under the ground.

★★16.It rained heavily last night.= There was a heavy rain last night.

　 It will be snowy tomorrow. = It will snow tomorrow.= There will be snow tomorrow.

11. “I’m trapped,” I said to myself.　　　　　　　　　　　　

★12.A moment of fear went through my mind but I told myself to calm down since I was still alive.

★★13.People were in a great hurry to move away the bricks and stones.

★14.He survived the earthquake in 1999.

8.Some people ran out of the shopping centre. I tried my best to run out to the street, too.

★9.People ran wildly as pieces of glass and bricks fell down. Then the walls began to come down too.

★10.I did not even know where I was(宾从).

3.A young boy fell from a tree and hurt his legs.

★4.A coach crashed into a tree last night.

★5.At first, I felt a slight shaking through my body.

★6.People looked at each other in fear.

★7.People ran in all directions. They didn’t know where to go.