What ________ if there ______ no water or air on the earth?
| A．happen, is | B．will happen, is |
| C．will happen, will be | D．happen ,are |
What ________ if there ______ no water or air on the earth?
| A．happen, is | B．will happen, is |
| C．will happen, will be | D．happen ,are |
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