When leaders of Chinese mainland（大陆）and Taiwan met in Singapore for _____first time since 1949，President Xi said，"Today will be remembered in ______history．"（ ）
A．the；theB．the；/C．/；/D．/；the
A primary school in England has ____ signs at its three entrances（入口）， saying： Greet your child with a smile， not a mobile．（ ）
A．put intoB．put offC．put onD．put up
The TV news reports that there ____ a storm the day after tomorrow．（ ）
A．isB．wasC．will beD．has been
When you are in your school dining hall during lunchtime， you may not feel lonely _______ you can find someone to have lunch with．（ ）
A．ifB．unlessC．afterD．because
I didn't see you ____ in． You must have been very quiet．（ ）
A．comesB．to comeC．comeD．have come
Of all the blue holes in the world， Sansha Yongle Blue Hole in the South China Sea is now ____． It is 300.89 meters deep．（ ）
A．deeperB．very deep
C．as deep asD．the deepest