---Mary’s score on the test is the highest in her class.
---Really? She ______ have studied very hard.
| A．may | B．ought to | C．must | D．should |
Having been attacked by terrorists, ______.
| A．doctors came to their rescue | B．the tall building fell down |
| C．an emergency measure was taken | D．warnings were given to tourists |
At first sight, it ________ look like a generous offer; actually, it is a trick.
| A．may | B．must | C．shall | D．should |
Tom was so wild about computer games that he would stay online for ten hours _____every day.
| A．in the end | B．in particular | C．on end | D．on purpose |
It takes a long time to ____ a good name，but this name is quickly lost by just one piece of bad behavior.
| A．pick up | B．think up | C．build up | D．make up |
According to the rules of the factory, you can ask for leave ________ you have a doctor’s diagnosed note.
| A．now that | B．on condition that | C．unless | D．even though |