AIDS is said ______ the biggest health challenge to both men and women in that area over the past few years.
| A．that it is | B．to be | C．that it has been | D．to have been |
The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.
| A．held on | B．worked out | C．touched on | D．kept out of |
At first the institute refused to purchase the telescope, but this decision was _____ revised.
| A．occasionally | B．consequently |
| C．successively | D．subsequently. |
No one imagined that the apparently _____ businessman was really a criminal.
| A．respectful | B．respectable | C．respective | D．respected |
The beauty of the place is more than I can describe. I am sure whoever sees it will _____ its charm.
| A．appeal to | B．stick to | C．keep to | D．yield to |
. The old man got into the _____ of storing money under the bed.
| A．tradition | B．habit | C．use | D．custom |