This new kind of chemicals will help keep the air, soil and water________ from pollution.
2. After the earthquake, we can see the of the village
II. Choose the correct answers. Few people are able to of the future but we can imagine it.
The math’s problem remained confusing to the boy although ______ over and over.
As a rule, you can borrow only two books ______ in the library.
This kind of desk can be ______ to the height you need.