1. My pen is lost. Can I use __________(you)

　　2. These__________ are heavy. We can't carry them. (box)

　　3. The more exercise you take, the __________you will be. (health)

　　4. ---Are they the __________ parents

　　---Yes, they are. (twin)

　　6. We are going to have a picnic unless it __________ (rain).

　　7. ---What's twenty and twenty

　　---It's __________. (four)

　　8. There __________ any rain since the beginning of this month. (not be)

　　9. The picture __________ to a museum in Beijing in 2004. (sell)

　　10. Kate did her homework so __________ that she made few mistakes yesterday. (care)

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