Mr. Bush is on time for everything. How ____ it be that he was late for the important meeting?
| A．can | B．should | C．may | D．must |
Great changes _________ in China in the last two decades.
| A．have taken place | B．took place |
| C．have been taken place | D．are taking place |
We must set a limit __________ the expense of the trip.
| A．to | B．on | C．for | D．with |
He’s thinned down a lot since he ___________ a diet.
| A．got on | B．put on | C．kept on | D．went on |
--- Did you find your book last night?
--- Yes, I finally managed __________ the book I was looking for.
| A．to find | B．finding | C．to found | D．founding |
What are the differences between the American and British ____________of government?
| A．systems | B．religions | C．customs | D．theories |