rewrite these pairs of sentences into one sentence that conveys the same meaning using an adverbial clause  1)the bell rings. i...

rewrite these pairs of sentences into one sentence that conveys the same meaning using an adverbial clause 
1)the bell rings. i open the door. 
2) she was writing a letter. the lights went off. 
3) she reaches office. he calls his wife. 
4) the father comes back home. the children throwing pillow at one another. 
5) i was watching television. the telephone rang.