You can't always____the train arriving on time

A.take on B.come on C.carry on D.depend on

We all know that ,_____,the situation will get worse.

A.not if dealt carefully B.if not carefully

c.if dealt not carefully with D.not if carefully dealt with

My dictionary has disappeared .Who ___have taken it ?

A.should B.must C.could D.would

请解释一下，谢谢。

d 指望火车准点到达

d 如果不认真对待

c 可能性