6．Be careful! The slightest spark（火花）could ______ the fireworks.
| A．set about | B．set off | C．set out | D．set up |
The teacher always makes his class so ______ and interesting for us.
| A．Lovely | B．living | C．live | D．lively |
There is no experience ______ is more exciting than skating on real ice.
| A．that | B．what | C．this | D．it |
–How did it ____that you missed the bus ?
- I’m sorry I got up late.
| A．come up | B．come about | C．come out | D．come on |
Jumping out of _______ airplane at ten thousand feet is quite _______ exciting experience．
| A．an; an | B．不填; an | C．不填; the | D．the; the |
---I think we should buy a car so that it will be convenient for us to go to work.
---______, but do you think we have so much money ?
| A．You are joking | B．Come off it |
| C．I don’t believe it | D．You are dead right |