We should make contributions ______ our environment.A. to protecting B. to protect C. protecting
--- Look! What's in_______ sky? --- Oh, it's _______ UFO. I wish I could fly in_______ space some day.
–– Would you like to play table tennis with us after school?–– _________.
–– Let’s fly kites.–– _________.
Eddie eats __________ food every day. Hobo thinks he needs some __________.
The letter from parents makes David __________ blue.