1. — Have you known each other for long? — Not very long, ____ we started to work in the company.
Lawrence Craven is the author of several published reports, one of _____ introduced the idea _____ aspirin could reduce the risk of heart attacks.
Have you got any books on psychology on the shelves of your private library? I’d like to borrow _______.
It is spring now. The flowerssweet in the botanic garden attract the visitors to the beauty of nature.
E-mail, as well as telephones, an important part in daily communication.
Jane is ill and Annie is going to _______ this week.