17.The employees___more enthusiastic about their work since their pay rose.
A、are
B、have been
C、were
D、will be
20.In October 2007,the Chang'e-l satellite was successfully __at Xichang.
A、launched
B、presented
C、regulated
D、engaged
II.Vocabulary and Structure(15 points) Directions:There are 15 incomplete sentences in this section.For each sentence there are four choices marked A,B,C and D.Choose one answer that best completes the sentence and blacken the corresponding letter on the Answer Sheet. 6.I asked two passers-by how to get to the new railway station,but___of them knew it.