Why didn’t you go to play football with us yesterday afternoon? —I _____my mother with the housework then.

The students the Art Festival when I passed by their school.

What are you doing at the moment? —I am ______ my turn to borrow books.

What do you think of Billy, the shortest boy in our class? —I think he is _________ honest boy.

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