Lin Yi isn't what it used to be. The last decade__________ great changes in the city images.
| A．witnessed |
| B．was witnessed |
| C．has witnessed |
| D．had witnessed |
----_____he dropped out of school?
----His family has run into financial difficulties.
| A．Why was it that | B．Why was that | C．Why was that it | D．Why was it |
When I talked with my grandma on the phone, she sounded weak, but by the time we ____ up, her voice has been full of life.
| A．were hanging | B．had hung | C．hung | D．would hang |
The matter ____ your fate cannot be taken for granted.
| A．relating to | B．related to | C．relate to | D．to relate to |
Nowadays people sometimes separate their waste to make it easier for it to _____.
| A．reusing | B．reused | C．reuses | D．to be reused |
Some people fear that _____ air population may bring about changes in _____ weather around the world.
| A．/; the | B．the; / | C．an; the | D．the; a |