1 While i (sleep) ..the phone(ring)...

=>was sleeping/ rang

2.We'll need (call)...him more often!

=> to call

3.You should avoid (use)..too much short hand

=> using

4,We plan(have)...a picnic this sunday

=> to have

5. When i first (meet)...him, he (work)..in a restaurant

=>met/ was working

6.He (know)..a little english,so he wishes he ( can?speak).. it well

=> knows/ could

7. It's 8 am. he (work)... at the office

=> is working

8. You should(learn) how( keep)... the enviroment unpolluted

=>learn/ to keep

9. That is one of the city churches the ( destroy)..by bombing during the war

=>was destroyed

10.It is necessary (avoid)...(go)..out at rush hours

=>to avoid/ going

1, was sleeping/ rang

2, to call

3, using

4, to have

5, met/ was working

6, knows/ could

7, is working

8, learn/ to keep

9, was destroyed

10, to avoid. going