—My goodness! The accident might not have happened if we had done it more carefully.—But we      .

---Imagination     important in science, and it helps us dream up our future.---You are definitely right. If only something         allow me to see insects and spiders magnified without getting close to them.

When a pencil is partly in a glass of water, it looks as if it ______.

Don’t take the lift in a fire because the lift __________ become trapped between floors.

You should have told me there was no meeting today, I ___ have run all the way here through the heavy rain.