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 |
- Could you walk me to the railway station?
-____.I've got nothing to do anyway.
| A．It depends | B．No problem | C．Forget it | D．Never mind |
---It’s reported that young people are responsible for 60% of the traffic accidents.
---Exactly. Young drivers are far more _______ to drive faster than old ones.
| A．possible | B．probable | C．likely | D．perhaps |
The living room is clean and tidy, with a dining table already ______ for a meal to be cooked.
| A．laid | B．laying | C．to lay | D．being laid |
Global warming caused by human being’s casual behaviour has become a major _______ for people all over the world.
| A．conflict | B．concern | C．challenge | D．factor |
----I hear that Tom was badly injured in a car accident and is in hospital now.
-----_________, let’s pay a visit to him.
| A．If any | B．If so | C．When possible | D．When necessary |