They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space.
| A．what | B．that | C．which | D．who |
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Since the beginning of the vacation，I______ across the country，and my next stop is the Wuyi Mountains．
| A．had traveled | B．will travel | C．have been traveling | D．was traveling |
Once again he didn’t hand in his homework _____ he had been given enough time to do it．
| A．in case | B．as though | C．so that | D．even though |
---They live on a busy road． --- There ______ be a lot of noise from the traffic．
| A．must | B．may | C．would | D．could |
．_____ the chapter four times, I finally understood the author's theory．
| A．Reading | B．Having read | C．To read | D．Read |
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