20.The children are having a lot of__________with the building blocks.
A. joy
B. interest
C. cheer
D. fun
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21.Thank you very much. That's__________what I want.
A. directly
B. certainly
C. exactly
D. likely
22.Camel is a kind animal living in__________.
A. sea
B. desert
C. land
D. forest
23.If you want to be a commander, you must stand all kinds of__________.
A. try
B. experiment
C. testing
D. trial
24.I paid only £500 for this used car but it's__________much more.
A. worth
B. worthy
C. wound
D. windy