__________ in thought，he almost ran into the car in front of him．
| A．Losing | B．Having lost | C．Lost | D．To |
The two things are the same in outward form but different _____.
| A．in addition | B．in brief | C．in common | D．in essence |
_____ it is a good thing I did not get the post I had applied for, though I must admit that I was disappointed at the time.
| A．By the way | B．In a way | C．In the way | D．In no way |
_____ inviting guests and not treating them properly!
| A．Strangely | B．Fantastically |
| C．Surprisingly | D．Fancy |
With sufficient scientific information a manned trip to Mars should be _____.
| A．obtainable | B．potential | C．considerable | D．feasible |
The generation _____ makes it difficult for parents to understand their children's opinions.
| A．division | B．gap | C．separation | D．interval |