--- This returned Chinese scholar has become one of the top experts in this field.
--- Yes, I know him very well. He_________in Africa on wild animals for eight years.
| A．has worked | B．had worked |
| C．worked | D．has been working |
He was known to have been hanging about and was not expected to pass the test. ______, his failure came as no wonder to his parents.
| A．However | B．Instead | C．Besides | D．Therefore |
My brother likes eating very much but he isn't very _____ about the food he eats.
| A．particular | B．peculiar | C．special | D．unusual |
The bridge ________ , after it is completed, will surely shorten the distance between the two cities.
| A．building | B．built | C．being built | D．having built |
_____ he has been blind since birth, Joseph Chadbourne never feels different from his class-mates at school.
| A．Since | B．Once | C．Unless | D．While |
The last Thursday of November, _______ as a day of thanksgiving in western countries, is an important festival.
| A．observing | B．being observed | C．to be observed | D．observed |