----Why does the lake smell terrible?
-----Because large quantities of water_______.
| A．is being polluted | B．have been polluted |
| C．is polluted | D．has been polluted |
I can't tolerate being made fun of，________never to come again.
| A．determined | B．being determined |
| C．determine | D．to determine |
Many years later，the father returned form the army and found that his daughter was no longer ________she used to be.
| A．what | B．how | C．when | D．whom |
Though he came from a family similar ________mine，we have little similarity ________taste.
| A．with；to | B．to；in | C．in；to | D．to；for |
The pyramid ________how many years ago，do you know?
| A．dated back to | B．dated from |
| C．dates back | D．dates back to |
The shepherd had to round up the sheep ________first night fell.
| A．until | B．before | C．after | D．till |