He wrote many children’ s books, nearly half of____ were published in the 1990s.
I am so glad that I have found the same modern computer ____ I am working on.
We should 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.