________ the question of how global warming has _________, we are doing some projects at school.
What sense do you think ____ will_____ to argue about it?
Because of the hard work of the farmers, the desert finally ______ rich farmland.
What difficulty will you have _______ people when you stay in a foreign country?
---- Do you feel like walking there or shall we _____ bus? ---- I’d like to walk. But since there isn’t much time left, let’s______ taxi.
My uncle’s house in the downtown area is a bit smaller than that in the countryside, but it is twice _________ expensive.