—How long can I keep the book? —A week. You _____to return it by Monday.
You’d better _____ his name, address and telephone number in your notebook before you forget them.
Driving past the crossroads, I found a little girl ____ on the sidewalk crying.
We won’t give up ______ we should fail twenty times.
Honey, it’s your turn __________ the dishes.
Hawking is known _________ the greatest scientist alive.