--Can you tell me the way to the post office, please ?--_______, I don't knowA.Excuse me.B. SorryC. OK.
This is a big class,and _________of the students _________boys.
Spacecraft can travel ______the speed of light .
In 2100, people will by robots.
I wonder ___________ from Beijing next week.
Last night someone_______ the shop and took away lots of watches.