To his mind, the collaborative development of Beijing, Tianjin and Hebei province is to solve the problems _____ Beijing faces, such as overpopulation, traffic jams, and etc.
After many years both countries have come to realize that neither side could ever succeed in getting rid of _____ by means of war.
--- What about ___ book? --- It’s too difficult ___ book for beginners.
He is a man of few words; besides, it’s hard to ___ his mind.
It is raining heavily. Little Mary felt cold, so she stood ___ to her mother.
When ___basketball, you should be careful not to hurt yourself.