下列各组字母中含有相同音素的一组是 ____。
We should spend ______ money solving ______ problems.
Would you please _____ the children ______ with snakes?
The students come to school early, but the teachers come ______.
He made a fire ______ himself _____ warm.
--- Did you see any monkeys in the zoo? --- I saw _____. They were all sleeping then.