---I’m sorry I can’t help you now.---__________A. You’re welcome.B. Let me see.C. Thank you all the same.
--Mary,would you like to visit the Science Museum with me? ---_______,but surfing the net seems more interesting.
---I feel tired and sleepy. ---Why not stop_____?
She jumps _____of us four.
Lingling comes ______than any other student in her class every day.
_______is really difficult for them_______the mountain.