_____ the three elements of productive forces, namely, the people, the means of production and the subject of labor, the people is that most critical.
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.