19．This library was ranked ______ one of the best libraries in the world_____ honor of its contribution to the people．

---Keep me informed _______ the latest news.
---Ok.

Every morning the pupils read the texts ____ in the classroom.

My father warned me_______going to the West Coast because it was crowded with tourists.

So far we have done a lot to build a low-carbon economy, but it is________ ideal. We have to work still harder.

. I agree to his suggestion__________the condition that he drops all charges.

Japan is ____ the east of China, while India is ____ the west of China.

The summer holiday is just ____ the corner. How do you plan to spend it?

____ hands and knees Helen Thayer got the tent up.

Guilin is famous ____ its beautiful hills and rivers, while Kunming is famous ____ the Spring City.