Things are ________ on Mars ________ on Earth because of the different gravity.
Health experts believe that even a little exercise is better than______ at all.
---I’m going to do for your party. ---Sounds great!.
There are many tall buildings on ____ sides of the street .
---Would you like milk or juice? ---__________ is OK. I really don’t mind.
There are some trees on one side of the road and some factories on _____.