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In case you have a frozen screen, you should restart the computer. Doing so gives your system a chance to reset and start fresh. The best way to restart a frozen computer is to hold the power button down for five to 10 seconds.
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In the text above, the modal verb “should” expresses
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In the sentence “Scientists also group trees based on whether they lose their leaves” (line 8), the conjunction “whether” could be correctly replaced with if.