In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
| A.it marked | B.marking | C.marked | D.to mark |
I was really too busy with my homework and I couldn't help ____________ housework.
| A.doing | B.do | C.did | D.done |
Mary is one of the brightest students who_________ from New York University.
| A.is graduated | B.have graduated |
| C.has graduated | D.are graduated |
Mr. Alcott, headmaster of the school, refused to accept made by the Students' Union.
| A.either | B.neither | C.any | D.none |
Mary is short__________ her brother is very tall.
| A.still | B.nor | C.while | D.when |
There was less food for birds and also for the Prairie dog, an______holes in the ground.
| A.livs | B.is living | C.living | D.lived |