Fresh air, enough exercise and nutritious food ______ to sound health.
| A．devote | B．add | C．contribute | D．stick |
Tom received an invitation to dinner, and with his work ____, he gladly accepted it.
| A．finished | B．finishing | C．having finished | D．was finished |
Her mother does not _____ of her going to study in the United States alone.
| A．admit | B．agree | C．prove | D．approve |
The most successful retired athletes are those who can ____ the life skills they learned in sports to another area of life.
| A．contribute | B．employ | C．apply | D．arrange [ |
I like getting up very early in summer. The morning air is so good ____.
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |
Some researchers believe that there is no doubt ____ a cure for AIDS will be found.
| A．which | B．what | C．that | D．whether |