用所给的词填空：

because, since, as, for

1)—Why didn't he come to school this morning?

  —________ he went to the doctor.

2)It is ________ he is too lazy.

3)I must be leaving now, ________ it's getting dark.

4)________ everyone is here, Let's begin our meeting.

5)________ he didn't know much English, he got out his dictionary and looked up the word“cough”.

句型转换

Her uncle seemed to be acting rather strangely towards her.

________ ________ ________ ________ ________ ________ acting rather strangely towards her.

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They marched on silently.

They marched on ________ ________.

句型转换

I'm sure that your life is in danger.

There is ________ ________ that your life is in danger.

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They became rich ________ hard work.

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The blind man makes a living ________ begging.

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We hope ________ better results.

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The whole nation was in deep sorrow ________ this news.

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Many thanks to you ________ what you have done for me.

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He held an umbrella ________ me and we walked ________ the umbrella.