He bought a new building ______ top is different from others around.
| A．what | B．which | C．that | D．whose |
____ caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |
____ is a fact that English is being accepted as an international language.
| A．There | B．This | C．That | D．It |
You can’t imagine ____ when they received these nice Christmas presents.
| A．how they were excited | B．how excited they were |
| C．how excited were they | D．they were how excited |
－What did your parents think about yourdecision?
－They always let me do_____I think Ishould．
| A．when | B．that | C．how | D．what |
Doris'success lies in the fact____she isco-operative and eager to learn from others．
| A．which | B．that | C．when | D．why |