. Some experts are warning that the step the US government has taken to deal with the current crisis is ______ of much risk.
| A．ones | B．one | C．that | D．those |
He said______ his sister had passed the entrance examination of college, and______she would go to college in about 20 days.
| A．that; ／ | B．that; that | C．／; ／ | D．that; which |
Mr. Smith was so angry at all ______ Bill was doing ______ he left.
| A．that; what | B．that; that | C．which; which | D．what; that |
The traditional view is ______ we sleep because our brain is “programmed” to make us do so.
| A．when | B．why | C．whether | D．that |
______ he referred to in his article was unknown to the general reader.
| A．That | B．What | C．Whether | D．Where |
____ matters most in learning English is enough practice.
| A．What | B．Why | C．Where | D．Which |