The earth will become worse and worse ________ we do something to stop her from being polluted.
| A．if | B．even if | C．when | D．unless |
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Therelots of people at the restaurant when 1 got there.
| A．is | B．was | C．are | D．were |
George reads the newspaper every morning. That'shabit.
| A．he | B．him | C．his  |
D．himself |
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| A．when she will come back | B．when she came back |
| C．when will she come back | D．when did she come back |
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