21. -- bad weather! It looks like rain. Why not take __ umbrella with you?
-- Thank you. But I don't think it's necessary. I' ll try to come back before it starts to rain.
A. What a; an B. How ; / C.What; an D. How a; a
22. -- China has a large population!
-- The population of Australia is ____ than ___ of China.
A. smaller , that B.smaller, it C.fewer, that D. less, all
