I don't think the experiment is _____ failure. At least we have got _____ experience for our future work on _____ nature.
Raising children is said to be a job _______ parents receive the least formal training.
_______ blood if you can and many lives will be saved.
— I saw Dave in the lift this morning. — Really? He _______ around here for a long time.
— Could you send me an application for the TOEFL?— _______. What’s your name and address?
It is very important for us to _______ between good and bad.