1 . It ______ that the blood on the suspect’s shirt was from killing hens and ducks.

A．broke out

B．turned out

C．worked out

D．gave out

2 . Tom太聪明了，解答了这道数学难题，取得了班里最高分。
Tom was ________ ________ to ________ ________ the difficult maths problem and got the highest mark in his class.

3 . 我希望下周所有的事情都能顺利解决。
I hope all the things will ________ ________ smoothly next week.

4 . 这道题目虽然看起来容易，实际上很难解决。
________ the problem seems easy, it’s hard to ________ ________ in fact.