don’t think Jack _____ what happens to his family. He is so selfish.

Mr Black is an experienced engineer, and he will beemployed to ______ us in improving our equipment.

The Green Corporation donated the property to the state of California, with one condition ____ the Green family would be allowed to use it when they wished.

171We’ll hold a sports meet in our school if it __________ next weekend

There is _______wrong with my computer and it requires _______.