John promised his doctor he_____notsmoke, and he has never smoked ever since.[ ]

Scientists are convinced ________ the positive effect of laughter ________ physical and mental health

Why ____________ enjoy Beijing opera withus

ew firm will ________the crowds,whatever its quality, as long as it gets advertised in the right way.

5 About 40 _____ of the population of thatcountry _____ on farms