All the guests at the party were dancing and singing happily _____ the electricity was cut off.
| A．until | B．while | C．when | D．because |
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 |
She makes _______ effort to learn maths and she has made _______ great progress in it.
| A．an ; a | B．/ ; a | C．the ; / | D．an ; / |
Only in a few countries in the world _______ a reasonable standard of living.
| A．enjoyed people have | B．people have enjoyed |
| C．people can enjoy | D．can people enjoy |
They came together with the same ______ about the earth’s environment and the same dream of co-existing peacefully.
| A．attention | B．concern | C．tradition | D．business |