21.---Ann, here is _____big tree . What can you see behind _____tree?
---Oh, _____elephant is standing behind it.
A. a, the, an B. a, a, the C. the, a, an D. the, the, an
22.---Doctor, is there_______ wrong with my son? ---No, _____ is wrong.
A. something, anything B. anything , nothing
C. something, nothing D. anything , something
23. The man can write with______hand and draw with _______at the same time.
A. one; another B. one; the other C. first; second D. one; it
