Our teachers often tell us _______ the net bar.

ain ___________ obvious the moment Iwalked into the room, for the first man I met asked me pitifully:"Are you feeling all right"

People have planted a great many trees in order to ________ wind and sand in the desert. [ ]

Don’t forget to hand in your homework, Tom, will you—Sorry, I promise_______.

The famous scientist was goingout _____ he found himself surrounded by lots of young people