All experts agree that the most important consideration with diet drugs is carefully ___ the risks and benefits .
Only by bringing in new management, I guess, _______ our hotel from bad to worse.
In order to improve my English, I have made it a part of my daily _______ to listen to BBC every day.
—_______ you write so well? —By reading and keeping diaries every day.
Please _______ that stamp, for it is quite rare nowadays.
— Is it convenient for you to have a drink together this evening? — Sorry. That’s _______ I will be meeting an important guest at the airport.