If you want to be on the school football team， you _______ train harder．（ ）
A．canB．willC．mayD．must
Which of the following sentences is a FACT？（ ）
A．Xuzhou is in Jiangsu Province
B．Xuzhou is a beautiful place to go
C．Life in Xuzhou is getting better
D．People in Xuzhou are friendly
David said that the glass was broken and warned me __________ it．（ ）
A．don't touchB．to not touch
C．not to touchD．no touching
I went to work the next day，__________ I was still feeling unwell．（ ）
A．becauseB．untilC．unlessD．though
We should save energy by _________ the lights when we leave a room．（ ）
A．getting offB．showing off
C．taking offD．turning off
The teacher encourages the children to feel _________ about asking questions when they don't understand．（ ）
A．nervousB．confidentC．excitedD．practical