It is in the west of China _____  _____ is no doubt that it is going to rain tomorrow.

It was my sister        first had the idea to cycle along the river. 

In my opinion, all Mr. Li ______ good to his students in his class at present. He is very strict with them in their studies.

It was not until midnight __ they reached the camp site. 

—_____bargaining is so interesting?—Sometimes it is a test to see who stand their ground for the longest.