1.Don't___the ball on the ground,it's made of glass.
A,fall B,drop C,put D,place
2,what made Miss zhao __?
A,worried B,was worried C,to worry D,was worrying
3,__ the terrible snow ,they coundn't get out of the forest.
A,Because B,because of C,As D,since
4,I'm sorry that I__my homework at home.
A,forgot B,have forgotten C,left D,have left
最好能解释一下 答案我看不太明白 谢谢