The mother often tells her son to be a good boy, warning him to _____ trouble.
You’ve failed to do what you ___________ to and I’m afraid the teacher will blame you.
It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.
Whether by accident or ___________,he arrived too late to help us.
I was going to do some shopping in Golden Eagle, but __________ watching TV at home because of tiredness.
Don’t touch ______ live wire, oryouwill get______ shock.