.– You are not afraid of snakes, are you?
--- No, certainly not. Not rats, not flies, and ____ ants.
| A．at best | B．at least | C．best of all | D．least of all |
He must have attended the meeting yesterday,___________ he?
| A．didn't | B．mustn't | C．needn't | D．hasn't |
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 |
Mary is short__________ her brother is very tall.
| A．still | B．nor | C．while | D．when |
It’s clear__________ that a hard working student has___________ a great interest in science.
| A．不填; discovered | B．不填; developed |
| C．that; invented | D．that; developed |