1. The theory he _____ isn’t understood by most of the people.
A. put up B. put down C. put off D. put forward
2. We all think it is Jack as well as his wife that _____ for their son’s bad performance at school.
A. are to blame B. is to be blamed C. are to be blamed D. is to blame
3.Eating too much fat can ____ heart disease and high blood pressure.
A. relate to B. contribute to C. attend to D. devote to
