10. We went through a period _____ communications were very difficult in the rural areas.

The manager put forward a suggestion ____ we should have an assistant. There is too much work to do.

e get closer to the moon, we shall feel itsgravity pulling us, but it will not be ________ the earth’s.

Look! There comes our head teacher. —That ______ be him. He is in Indonesia.

______ a fresh mind for aninterview, be sure to have a good sleep the night before it.