In many countries the sign 
has the same meaning___this sign 
．But the sign 
means you are coming to a zebra crossing and you must slow down．It is different ___ this sign 
．（ ）
| A． |
as；from |
B． |
as；as |
C． |
from；as |
D． |
from；from |
﹣_______have you kept this book？
﹣For two months．（ ）
A．How soonB．How oldC．How longD．How often
I______sleep very well， but then I started doing yoga and it really helps．（ ）
A．didn't use toB．used to
C．was used toD．wasn't used to
﹣Don't keep the lights on when they're not in use!
﹣____（ ）
A．Not at all．B．Sorry， I won't．
C．No， thanks．D．I'm afraid so．
You haven't eaten all day． You___be very hungry．（ ）
A．couldn't beB．can't
C．mightD．must
﹣Do you know______________？
﹣Sorry， I've never had an e﹣book before． Why not read the instructions first？（ ）
A．how can I turn the e﹣book on
B．how I can turn the e﹣book on
C．where can I buy an e﹣book
D．where I can buy an e﹣book