It is clear that in modern society high _______ and demands are placed on students.
| A.motivations | B.expectations | C.standards | D.opportunities | 
On Monday morning it usually me an hour to drive to work although the actual distance is only 20 miles.
| A.takes | 
| B.is taking | 
| C.took | 
| D.will take | 
The flowers sweet in the botanic garden attract the visitors to the beauty of nature.
| A.to smell | 
| B.smelling | 
| C.smelt | 
| D.to be smelt | 
It was 80 years before Christopher Columbus crossed the Atlantic _____ Zheng He had sailed to East Africa.
| A.when | 
| B.that | 
| C.after | 
| D.since | 
Whenever he was asked why he was late for class, he would answer carelessly, always the same thing.
| A.saying | 
| B.said | 
| C.to say | 
| D.having said | 
The old clock needs every day, otherwise it will stop working.
| A.to turn up | 
| B.to wind up | 
| C.winding up | 
| D.wind down |