21. China is not ________ it was yesterday.

A. what         B. that         C. which       D. as

22£®Someone had better _________ a solution fast.

A£®come out        B£®come about   C£®come up with   D£®come across

23£®I think I will ________ golf in my spare time.

A. take up      B. take in     C. take out       D. take on