1.why is there so much ice in it? maybe you didn't close the

1.why is there so much ice in it? maybe you didn't close the door tight.
everybody knows it is important to keep the doors of a fridge closed, （nobody left it open.）请问括号内的这句话怎么译?
2.there is nothing wrong with keeping a snoke if you like it.请问此句中的 with 是什么意思,能去掉吗?
3.A goldfish can weigh up to 40 grams. this box weighs five kilograms.请问weigh up 和weigh的区别.谢谢