There is still a long way to go to work out all the problems ________ conservation of natural resources.[ ]

Every year there are about _______ people waiting for their trains back home in the railway station before Spring Festival comes.

When you _____ into the gallery, you feel as if you____ inside a fragile, white seashell.

6．— Is there any possible way to help them get rid of such a bad habit? — To tell the truth, it’s very hardBut we teachers________on this problem

_________no doubt that the earthquake is the most serious one in China’s history[ ]