Some scientists think that it may take ______years to make robots look like people, and do the same things as us.

About 56 ____ people live in this country.

I find difficult for Tom to reach that picture.He is a little short.

Mr. Wang __________ be in the office. The light is still on.—No, he __________ be. Because he phoned me from the farm just now.

Rose, mind your step! Aunt Jane slipped over on the wet floor and broke her leg yesterday． — ______．