16.A sneeze cannot be performed voluntarily, ______ be easily suppressed.
a. nor it can b. nor can it c. it cannot d. and cannot it
17.______ notebook and report that I promised you last week.
a. Here is the b. Here are the c. Is here the d. Are here the
18.______ a little more time to think, he might have acted more sensibly.
a. Ifhe took b. If he has taken c. had he taken d. Should he take
19.Beneath our feet ______ that our life depends on for food and clothing.
a. the earth lay b. the earth lies c. lie the earth d. lies the earth
20.______ the beginning of the 19th century did scientists know that all matter is made up of atoms.
a. At b. By c. Up to d. Not until
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