—What did he say his stupid behavior?—He admitted having made a serious mistake.
I am so glad that I have found the same modern computer ____ I am working on.
. We would do more such exercises in the future, I think, ____we did yesterday.
. ____ it will do us harm or good remains to be seen.
. The river, ____ are covered with trees, is very long.
He is rather difficult to make friends with, but his friendship, ____, is more true than any other.