33.When problems such as energy crisis, pollution and population explosion_________, people are asked to share the bitterness and endure the hardship with all the whole nation of the times.
I ’m sure _______ bread of this kind is only sold in _______ city of Harbin.
The seaman _____ swim only half way before he drowned.
---Need you leave so soon? ---Yes, _____, I’m afraid.
There is a little time left. We _____ hurry.
The Internet has made it possible ______ in a very convenient way around the world.