Life is like riding a bicycle. ________ your balance, you must keep moving.
My uncle was poor but he _______ often dress up as a rich man
A man landed on Mars? You must be joking. It ______ be true.
It’s nearly time for class to start. The teacher _______ be here soon.
It was playing computer games that cost the boy plenty of time that he ______doing his lessons.
------We want someone to design the new art museum for us.------______the young fellow have a try?