Polar bears live mostly on _____ sea ice, which they use as ___ platform for hunting seals.
| A．a; a | B．a; the | C．不填；a | D．the; 不填 |
____ is mentioned above, the number of the cattle here has been limited to 200.
| A．It | B．Which | C．That | D．As |
--- Any phone call for me?
--- Yes.____ telephoned 10 minutes ago.
| A．A Doctor Simpson | B．The certain doctor |
| C．The Tim Smith | D．A Simpson Doctor |
"No, no ", he whispered,____ talking to himself.
| A．while | B．even if | C．as if | D．when |
---Is it Pro. King that will give the lecture on radiation?
--- I can't __ I know it for sure.
| A．say | B．tell | C．speak | D．talk |
1 haven't got a single ______from Aunt Mary since I last saw her.
| A．advice | B．news | C．message | D．information |