An artist who was recently traveling on a ferry to the southern island discovered ________ a long lost antique Greek vase.
| A．at random |
| B．by chance |
| C．in turn |
| D．on occasion |
29.An example of them is fraud, a crime _______ money is stolen by cheating others.
| A．which | B．that | C．what | D．Where |
28. Dr. Frank failed many times but he finally _____ to find a successful way to solve the problem.
| A．broke off | B．broke up | C．broke down | D．broke through |
27.---Where have you been?
---I got caught in traffic, otherwise I _______ here earlier.
| A．would be | B．have been | C．had been | D．would have been |
26．—May I ask a question after class，sir?
—____，but not during my lunch break．
| A．Take it easy | B．No way | C．Certainly | D．Go ahead |
25．The fire spread fast．Luckily the local government had brought it under control___the situation got worse．
| A．though | B．until | C．before | D．Since |