The Education Department says that school safety has set off alarm bells with frequent reports of
serious accidents______ students got injured or killed.
| A．after which | B．in which | C．by which | D．for which |
Some people would rather ride bikes as bike riding has ________ of the trouble of taking buses.
| A．nothing | B．none | C．some | D．neither |
In America, if ________ friend has invited you to drop by anytime, it is ________ best to call before visiting to make sure it is convenient for him.
| A．a; a | B．the; a | C．a; 不填 | D．the; 不填 |
______ I admit that the problems are difficult, I don’t mean that they cannot be solved.
| A．Unless | B．While |
| C．Since | D．When |
To her, it is a wonderful place because you never know what it may have_______.
| A．in common | B．in store |
| C．in sight | D．in turn |
She made a conscious attempt to look _______ though she felt tired out.
| A．pleasant | B．available |
| C．thoughtful | D．fresh |