Have you been to Suning Plaza（苏宁购物中心）in our city？
No．Although it____for more than a week，I'm far too busy to go there．（ ）
A．has startedB．has been on
C．has been openD．has opened
Ben， is physics your favorite subject？
Yes， and it is important one．（ ）
A．aB．theC．an
Have you heard about the TV program Reader is very popular now？（ ）
A．whichB．whoC．where
Frank will fall behind in studies he works hard from now on．（ ）
A．unlessB．becauseC．if
Could you tell me by Wechat？（ ）
A．what can we doB．what we can do
C．what do we do
David， make trouble at school． （ ）
A．can'tB．don'tC．doesn't