On Mother's Day， my mother was happy because I gave h a scarf as a present．
National Day celebrations for China's seventieth birthday in about three months．（ ）
A．will be heldB．will hold
C．is heldD．was held
of the students in our class_____going to the summer camp in Beijing next week．（ ）
A．Two fifths，isB．Second fifths， are
C．Second fifths， isD．Two fifths， are
﹣﹣﹣Listen! Is that Linda playing the piano in the room？
﹣﹣﹣No． It be Linda， she has gone to London．（ ）
A．may notB．needn'tC．can'tD．mustn't
Don't today's work for tomorrow．Today's work must be done today．（ ）
A．put upB．put outC．put offD．give up
I tried calling you your phone was out of service．（ ）
A．andB．butC．soD．or