They think wolves are dangerous _________humans so this leads _______the danger of wolves.

To see a young couple loving each other is；but to see an old couple loving each other is the bestsight of all

Most parents still hold the view______students should first put their hearts into their lessons

Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall

Only ______ the painting _______ decide whetherit is worth buying.