28. ____, he sometimes makes mistakes.
| A．Though he is careful teacher | B．As he is careful |
| C．A careful teacher as he is | D．Being a careful teacher |
He is always ready to help others, seldom, ______, refusing them when they turn to him．
| A．if never | B．if ever | C．if not | D．if any |
---Excuse me．Can you spare me a few minutes?
---______．
| A．What’s on? | B．What’s up? | C．What’s more? | D．What is it? |
--- Will $200 ______ the cost of the damage?
--- I’m afraid not．I need at least $100 more．
| A．do | B．include | C．cover | D．afford |
She felt sorry that she had disturbed the ______ calmness of a man she respected.
| A．regular | B．normal | C．usual | D．common |
______ in the school regulation that students shouldn’t use cell phones in the campus．
| A．What requires | B．What is required | C．It requires | D．It is required |