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Playing with a cell phone, he suddenly ________ the teacher staring at him.
A.knew of | B.became aware of |
C.reflected | D.aware for |
Shortly after the accident, two___police were sent to the spot to keep order.
A.dozen of | B.dozens | C.dozen | D.dozens of |
These tables and desks are all made of_____.
A.a wood | B.some wood | C.the wood | D.wood |
Jumping out of_____airplane at ten thousand feet is quite_____exciting experience.
A.不填; the | B.不填; an | C.an; an | D.the; the |
The warmth of___sweater will of course be determined by the sort of___wool used.
A.the; the | B.the;/ | C./; the | D./;/ |
Paper money was in___use in China when Marco Polo visited the country in___thirteenth century.
A.the;/ | B.the; the | C./; the | D./;/ |