If you are asked to sing an English song, what will you do?

Question 46: If you are asked to sing an English song, what will you do?
-> Should...
Question 47: Keep your feet dry or you will have a cold.
-> If....
Make sentences using the words and phrases given.
Question 48: You/ turn off/ lights/ before/ leave/ room/.
Question 49: Our/ future houses/ use/ solar energy/ and/ very/ friendly/ environment.