根据所给首字母或中文提示写出形式和意义都正确的词。
Now, smoke still rose up from the warm ground over d      the hills.
At universities and colleges you need a certain number of c      to be awarded a degree.
This would solve the problem of v   , for if a train entered this tunnel, it would draw in fresh air behind it.
Then in 1989, twenty-six years after the crash, the plane was accidentally r      in an aerial survey of the island.
Usually girls’ friendships are a    in shared feelings and support.
Their opinions      (冲突，抵触) with each other on this matter.
At the time, I thought that the whole      (概念；观念) of cloning was not moral.
We use human translators rather than machines as we believe they are more      (可靠).
She was really upset and __________ (发誓) that she hadn’t told anyone about my failure in the exam.
In most cases, you need to obtain a work      (许可证) so that you can work legally.