28. You can’t complain of being lonely____you don’t make any effort to communicate with others.
| A．when | B．until | C．unless | D．Once |
You are asked to attend the meeting ______ in the hall this weekend.
| A．being held | B．held |
| C．to be held | D．holding |
When ____ to danger and conflict, men tend to increase blood pressure, ____ nervous or anxious.
| A．exposed; feeling | B．exposing; felt |
| C．exposed; felt | D．exposing; feeling |
in the early 19th century，the school keeps on inspiring children’s love of art．
| A．To found | B．Founding |
| C．Having founded | D．Founded |
Every evening after dinner, if notfrom work, I will spend some time walking my dog.
| A．being tired | B．tired |
| C．tiring | D．to be tired |
With the loss of labor，the old farmers ________at home had to choose less labourintensive crops.
| A．left | B．to leave |
| C．having left | D．leaving |