Why didn’t you see me wave to you then—-Oh, If so. I must say sorry. I thinkI____ in the other direction.

If H2 burn in O2, we can get _____.

The local people like that Italian restaurant because it both delicious food and good service.

Could you give us some advice about this competition?—If you want to win first prize,your design for the museum must be________.[ ]

Can you see __________ bright light in the sky—Yes, I think it’s __________ UFO.