We aren’t sure of the weather. We _______ sightseeing unless it_________ tomorrow.

I thought _____ no use talking with him. _____ was a waste of time.

My sister is_____ young_____ go to school.[ ]

Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.

Jack and Tom reached Beijing ______ May 16, 2008.[ ]