High prices for corn and wheat will encourage ____ 。
At last, Peter made the baby ___ and begin to laugh.
When I got there ,I saw some boys _____ on the playground.
Some scientists think that it may take ______years to make robots look like people, and do the same things as us.
There ________ a basket ball match this afternoon.
What did your son say in the letter? He told me that he _____ the Great Wall the next day.