The new traffic rules that took effect on January 1 are much stricter than________in the past.
| A．that | B．this |
| C．it | D．those |
--Nancy is not coming tonight.
--But she ___________ !
| A．promises | B．promised |
| C．will promise | D．had promised |
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 |