Lab

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（　） before you leave the lab.

A:Make sure that the windows are shut B:To make sure that the windows are shut C:Making sure to shut the windows D:To be sure to shut the windows

______ before you leave the lab.

A:Make sure that the windows are shut B:To make sure that the windows are shut C:Making sure to shut the windows D:To be sure to shut the windows

______ before you leave the lab.

A:Make sure that the windows are shut B:To make sure that the windows are shut C:Making sure to shut the windows D:To be sure to shut the windows

（　） before you leave the lab.

A:Make sure that the windows are shut B:To make sure that the windows are shut C:Making sure to shut the windows D:To be sure to shut the windows

______ before you leave the lab.

A:Make sure that the windows are shut B:To make sure that the windows are shut C:Making sure to shut the windows D:To be sure to shut the windows