She devoted herself _____ the problems of the teenagers?

If he had been warned, he ______ that food yesterday.—- Luckily he was sent to the hospital immediately.

I promise _____ else can you find _____ bettercomputer at such a low price.

20. When Jack arrived, he learned Mary ____ for almost an hour.

After the quake, the whole city lay in ____ ruins. However, with all the efforts, ________ new Tangshan was born.