____ the displays of culture andtechnology, the Shanghai Expo also showcased the spirit of voluntarism.

e ______ atthe top of the hill, and what wonderful view you will see.

I had to buy ofthese books because I didn’t know which one was the best.

In summer，food will go bad if ________ in room temperature[ ]

Mike，is this Tom’s pencil—Oh，yes，it is ！