21.Tom owns _____ large collection of _____ books than any other student in our class.

A. the; /   B.. a; /   C. a; the    D. /; the

22.To be frank, our supply of food ________. We should get some immediately.

A. is running       B. is running out   C. is being short    D. is taking out

23.---What were you like when you were younger?

--- When I was a kid, I was kind of ________ .

A. ugly               B. short                   C fat                 D. immature