Mr. Ding, thank you _____ our English classes fun.—You’re welcome.[ ]

Super Junior is ________ great group. I really like their songs and dances.

My brother is very funny, and he often makes us .

Hello, Betty! Where are you now?— I ________ on the Great Wall of China and talking to you.

Scientists are working hard to make _______ possible for people to live on Mars in the future.