--- ________ of them knows the answer. What can we do now? --- Let’s ask a third boy for help.
A．Both B．Either C．Neither D．None
---Could you please tell me ___________? ---Of course. For over ten months.
A．how long has he left school B．how long he has left school
C．when he left school D．how long he has been away from school
---Congratulations to you on making such great progress!
---Thanks, but I would do better ________ I was given more time.
A．if B．unless C．though D．because
---I would like to sit in __________ front of the bus.
---Me, too. And we can have ________ better view.
A．/, the B．/, a C．the, a D．the, the
Mary _____ a photo of Professor Smith while he was making a speech.
A．took B．takes C．would take D．has taken
---Sorry, I’m late for class again.
---Is it ______ you stayed up last night?
A．why B．how C．because D．when
