12. ___________ energy is cheap, abundant and unpolluted.

A. Sun                        B. Sunny                C. Solar                 D. Solarize

13. He is writing this to tell her ___________ he loves and misses her.

A. how many                B. how much                C. how long                 D. how far

14. The baby ___________ be hungry again. He has just had dinner!

A. can’t                B. mustn’t                C. may                         D. may not

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