After a few years, Faraday      a job as personal assistant to Sir Humphry Davy
    A. offered      B. will offer     C. had offered     D. was offered

金属钾在氧气中燃烧能生成超氧化钾(KO₂)，KO₂与CO₂或水作用均生成O₂。现将一定量钠钾合金在足量氧气中燃烧，将反应产物置于水中并通入足量的CO₂，充分反应后，最多放出O₂的体积是最多吸收CO₂的体积的，则原钠钾合金中钠与钾的质量之比为(　　)

A．23?36 　　 B．46?39 　　　 C．115?39 D．23?78

Not until the train pulled into the station 　　　that his suitcase was gone.

　 A．did he find　　　　　　　　 B．had he found

　 C．he had found　　　　　　　　 D．he found

— Will you go to the party?

— Of course I will _____.

A. if invited            　　　　 B. if having invited

C. if I was invited      　　　 D. if I will be invited

The president stated that his country would not ________ anybody who raised a hand against their Allies.

A．tolerate B．oppose

C．go against D．distinguish

-- May I look at the menu a little while?

-- Of course. _______ , Sir. I'll be back in a few minutes.

A. Don't worry　　　 B. Enjoy yourself　　 C. No matter　　　 D. Take your time

　　　　　 about wild plants that they decided to make a trip to Madagascar for further research.

A.So curious the couple was?　　　　　　　 B.So curious were the couple?

C.How curious the couple were?　　　　　　　 D.The couple was such curious

After the war, a new school building was put up 　　　 there had once been a theatre.

　 A．that　　　　 B．where　　　 C．which　　　 D．when

Never laugh at failure of _____, because ______ enjoys being laughed at.

A．others; nobodyB．the others; everyoneC．the others; anyoneD．others; someone

—Nancy is not coming tonight.?
—But she_______.?
A.promises　 B.promised
C.will promise D.had promised