Rick，could you help me cook dinner？
Sure，_____．（ ）
A．no problemB．never mind
C．here you areD．you're welcome
Math is too_____ for me．
But it is very useful．Please don't give up．（ ）
A．deliciousB．favoriteC．difficultD．different
Which of the following is good behavior？（ ）
A．
B．
C．
D．
Sarah is ______than her sister Susan．Sarah is 166cm tall．Susan is 171cm tall．（ ）
A．shorterB．shortestC．tallerD．tallest
I'd love to go to the water park with you．But I _______ swim．
It doesn't matter．I will teach you．（ ）
A．mustB．mustn'tC．canD．can't