Only after we have taken into consideration all aspects of the problem _________ the right decision.
| A．we can make | B．make can we |
| C．can make we | D．can we make |
Oetzi, the 5,000 years old “Iceman”, ______on the alpine border between Italy and Austria in 1991.
| A．was discovering | B．was discovered | C．had been discovered | D．discovered |
________ 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 |