The ability to store knowledge makes computers different from every other machine _____ invented.
| A．ever | B．thus | C．yet | D．as |
We don’t have to keep these old chairs any more. ________, they are falling apart（支离破碎）.
| A．Therefore | B．However | C．Otherwise | D．Anyway |
—I’m surprised to hear that Sue and Paul have ________.
—So am I. They seemed very happy when I last saw them.
| A．broken up | B．showed up | C．dressed up | D．turned up |
Nowadays school bus safety has drawn much attention nationwide for children’s safety is _______ worries parents most.
| A．why | B．which | C．that | D．what |
—What is the price of gas these days? —Oh, it ____________ sharply since last month.
| A．is rising | B．has risen | C．is arising | D．has arisen |
If you are going to stay in the United States for longer than a(n) ______ visit, you may be interested in learning more about its people and culture.
| A．formal | B．regular | C．brief | D．unexpected |