He started to learn English in 1990 and in the years ________ he kept on using it in his work.
____ 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.
— Did you enjoy yourself at the party?— Sorry to say I didn’t. It was ____ a meeting than a party.
— Have you known each other for long?— Not very long, ____ we started to work in the company.