Take a taxi , _____ you'll miss your train .
The parcel was a whole week late. How I wish I ________ air mail instead.
—Could you please have my car ready today?—Sure, the damage is not that serious, so it ________ be ready by 5:00 pm.
The sleeping baby would be scared ________ a sudden loud noise.
—Mum, I'm tired.—Well, if you ________ go to bed after midnight every night, what do you expect?
Brain, like muscles, also needs some kind of exercise and nutrition. The more you use your brain in the right direction, the more you ________ enhance your ability.