用适当的连接代词或连接副词填空。
The problem ________ he can’t come to help us worries us a lot.
I have no idea ________ he will return.
I have no information ________ he went camping last Sunday.
He expressed the opinion ________ Tom should be made manager of the factory.
There’s no doubt ________ he was killed in the accident.
There’s great doubt ________ he did so or not.
He told me the news ________ his house had just burnt down.
Word came ________ the President of the USA would inspect the army.
We haven’t yet settled the question ________ we are going to spend our summer vacation.