Scientists are working hard to make _______ possible for people to live on Mars in the future.
—— . ——Size M. Can I try one on?
——Would you like something to eat? —— I’m not hungry.
——You’d better give up smoking. It’s bad for your health. ——
——You’re so lucky to have a best friend. What does he like? ——
——I’m sorry I broke your bike. ——