--- _______ can a tiger weigh, do you know? ---Yes, I know that a big one can weigh over 300 kilos.
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.
Ann says chocolate is good_____ health. I don’t agree ____her.
Do you know when she ___back tomorrow? If she ____back, please call me.