When the mother heard a bomb exploded _____ his son was working, her heart _______, wondering if her son was safe. [ ]

Can I borrow your ruler, please—Yes, you ________. But you must return it to mebefore lunchtime.

nce education programs the disadvantages of limited time, distance or physical disability, so they are becoming more and more popular all over the world.

Please don’t stand up in class until you ________.

We are all _______ to hear the_story.