A good teacher must be able to hold his students’ attention ____ he reaches the end of the class.
| A．when | B．after | C．until | D．unless |
__ unemployment and crime are high, it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
This special school accepts all disabled students, __ educational level and background.
| A．according to | B．regardless of | C．in addition to | D．in terms of |
--- Bill, can I get you anything to drink?
--- .
| A．You are welcome | B．No problem |
| C．I wouldn't mind a coffee | D．Doesn’t matter |
He did not regret saying what he did but felt that he ______ it differently.
| A．could express | B．would express |
| C．could have expressed | D．must have expressed |
Compared with his sister, Jerry is even more ____to, and more easily troubled by , emotional and relationship problems.
| A．sceptical | B．addicted | C．available | D．sensitive |