19.Frank took _____ of the fine weather to do a day’s work in the garden.（  ）

A.interest

B.chance

C.advantage

D.charge

19.C【解析】take advantage of sth.为固定搭配，意为“利用，发挥……的优势”。故选C。

20.—How did Mike get his car out of the ditch？

—_____it.（  ）

A.To push

B.From pushing

C.By pushing

D.Havin pushed

20.C【解析】题干特殊疑问句的疑问词为“how”，表明针对方式的提问。句意：—Mike是怎么把他的车从沟里弄出来的？—他把车推出来的。by doing sth.表方式、手段、方法，故选C。

21.______that the pilot couldn’t fly through it.（  ）

A.So severe was the storm

B.The storm so severe was

C.So the storm was severe

D.Such was the storm severe

21.A【解析】在so…that…结构中，若将so+形容词/副词置于句首，则其后的主句要用部分倒装。故C选项错误；B选项的正确形式应为“The storm was so severe”；D选项应为“It was such a severe storm”。故只有A选项正确。