Some people waste a lot of food ________ others haven’t enough to eat.
| A．however | B．when | C．as | D．while |
. School children must be taught how to deal with dangerous ________.
| A．states | B．conditions | C．situations | D．positions |
The survey shows that ______ of the population in the country ______ adults.
| A．three fifths; is | B．three fifths; are |
| C．three fifth; are | D．three fifth; is |
. The workers do nothing but _______ tea and talk to each other.
| A．drinking | B．to drink | C．drink | D．are drinking |
Every year, a great many visitors come to visit the temple ______ the 12th century, ______ has brought a large income.
| A．dating from; which | B．dated from; which |
| C．which dates from; that | D．which dated from; which |