“Tony, you’d better try too much chocolate. You’re already overweight,” said the doctor.
| A．not eat | B．not to eat |
| C．to not eat | D．not to eating |
________ a child begins school, he enters a world of vicious competition where success and failure are clearly defined and measured.
| A．Before | B．Until | C．Whenever | D．The moment |
Newton is known as a gifted scientist with very human weaknesses who stood at the point in history _______ magic ended and science began.
| A．that | B．when | C．where | D．which |
Researchers claim to have found the first proof _______ getting a regular eight hours a night really does make you appear healthier and more attractive.
| A．as | B．that | C．how | D．which |
Mr. Crossett was made __________ his experiment because of his poor health and old age.
| A．give up | B．giving up | C．to give up | D．given up |
It was for a lifetime of unselfish work among the sick natives ______ the old doctor deserved to be honored.
| A．who | B．that | C．which | D．whom |