--- I’m not good at singing, you know. --- ________! It’s just for fun.
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?
Jack tried to play a trick _____ his sister but she wasn’t taken ________.