—How ______ will his family return?—In a week.
I think it will be difficult ___ a robot ____ the same things as a person.
He is very happy , because he _____ in a big apartment next year.
—How many birds can you see in the trees?—I can see _________ birds in them.
A dog robot could help ____ the room.
—Where is Miss Wang?—She went to Hainan Island last week and will return _________ six days.