It can never be denied that        with a big family results in his quitting school.

_____ from the top of the tower, the east foot of the mountain is a sea of rape flowers. 

______ to train his daughter in English, he put an ad like this in the paper, “______, an English teacher for a ten-year-old girl.”

Though ____a difficult and even dangerous place , Vietnam is now a friendly destination that welcomes visitors from all over the world _______.

We should think of ways to stop the waste from the factory _____ our living environment.