At last the determination and patience of the scientists _______in 1996 with a breakthrough -------- the cloning of Dolly the sheep.
| A.paid off | B.paid out | C.paid back | D.paid up | 
—What bad luck! I had a cut in salary yesterday.
 —____.I warned you not to be late again and again but you ignored it.
| A.You asked for it | 
| B.Never mind | 
| C.Take it easy | 
| D.By all means | 
The____of hanging clothes across the street is a common sight in many parts of the city.
| A.routine | B.procedure | 
| C.reference | D.practice | 
____people from all walks of life are working hard to create ____new Hefei.
| A./; the | B.The; the | 
| C./; a | D.The; a | 
----Fancy meeting you here, Lucy! I never thought you visit us today.
 ----Sorry, I forgot to tell you I was coming. I hope you don't mind me____.
| A.calling in | B.pulling in | 
| C.breaking in | D.dropping in | 
If you go to the wildlife park, you will find the places there more dangerous than commonly_ __.
| A.supposing | B.suppose | C.to suppose | D.supposed |