--- Why does the lake smell terrible?
---Because large quantities of water .
| A．have polluted | B．is being polluted |
| C．have been polluted | D．has been polluted |
Either Jane or Steven _____ watching TV now.
| A．were | B．is | C．was | D．are |
_________ time and labor, cartoonists generally draw the hands of their characters with only 3 fingers and a thumb．
| A．To save | B．Saved | C．Saving | D．Having saved |
—Come in, please．Make yourself at home．
—I'm glad you like it．
| A．Thanks．You have a nice place here． |
| B．Oh, this picture is so beautiful! |
| C．Thanks．What nice food you've prepared! |
| D．OK．Let me look around your new house． |
—Which one can I take?
—-You can take__________ of them; I'll keep none．
| A．both | B．any | C．either | D．all |
Mr．Smith sold that magnificent cottage of his on the sea 2,000,000 dollars．
| A．at | B．for | C．to | D．by |