Cindy's grandmother is learning ____ the new mobile phone．（ ）
A．useB．usesC．usedD．to use
Which of the following suffixes（后缀）means "without"？（ ）
A．﹣ableB．﹣fulC．﹣ousD．﹣less
﹣_______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