Giải dùm mấy câu giúp với :3

`7.` No sooner had he left the office than the telephone rang.

`8.` Hardly had I put the phone down when the boss rang back.

`9.` Not until the bell rang did he finish his work.

`10.` There’s no point in getting Tom to lend you his car.

`11.` Only with difficulty did we succeed in winning the match.

`12.` I waited until she had finished her dinner to tell her that news.