---Let’s back up. Where was I?---You ___________________about the trip to South Africa.
It is no use _____ such mistakes. You should learn a lesson from them.
Peasants earn their living by selling agriculture ____ in China.
It was a matter of _____ would take the position.
When the teacher praised him for working out the math problem, Jack looked __________ about at his classmates.
You must come with us to the police __________ Our head is waiting for you.