Environment is very________，but you don’t understand the_______ of it，you
always drop litter everywhere．
| A．important，important |
| B．important，importance |
| C．importance，importance |
| D．importance，important |
She studies hard all the time；she never gives up________．
| A．study |
| B．to study |
| C．studying |
| D．to studying |
She works________in the city，but she doesn’t feel________．
| A．alone；lone |
| B．lonely；lonely |
| C．alone；lonely |
| D．lonely；alone |
She________short，but now she is tall．
| A．used to be |
| B．used to being |
| C．is used to being |
| D．is used to be |
—What do you volunteer________？
—I work at the local school．
| A．to do |
| B．do |
| C．to doing |
| D．doing |
He is an interesting man．He often makes us________．
| A．to laugh |
| B．laugh |
| C．to laughing |
| D．laughs |