______Which bag do you prefer , the green one or the pink one ?  ______ .I like a light blue one .

There are a lot of people in the park last Sunday. We had ______ to take a rest, so we got tired.

—Liu Qian is good at doing the tricks with the cards.—Yes, but if you watch carefully, you can see _______he does them.

Call us at _______ you need _______ 4008-823-823. KFC is ready for you!

- The air pollution is terrible.  - It will be worse ________ we take action to protect the environment.