1.You'd better ____ when you have some food in your mouth.

1.You'd better ____ when you have some food in your mouth.
A.don't speak B.not speak C.not to speak D.not speaking
2.This is____bottle.It is ____empty bottle.
A.the;an B.a;an C.a;an D.a;a
能说明为什么吗?
B应该是a;the