It is by no means clear ______ the president can do to end the strike．（2012．全国新课标Ⅱ）
| A．how |
| B．which |
| C．that |
| D．what |
This field of scientific research remains________.
| A．to be untouching | B．being touched |
| C．to be untouched | D．untouched |
The teacher just took down the names of the students _______ during the exam.
| A．caught cheating | B．caught to cheat |
| C．catching cheating | D．to catch cheating |
______ to get a seat for the concert, he didn’t mind standing in a queue all night.
| A．Determine | B．To be determined |
| C．Determined | D．Being determined |
_____ from other continents for millions of year, Australia has many plants and animals not found in any other country in the world.
| A．Being separated | B．Having been separated |
| C．Having separated | D．To be separated |
______ at the top of the Oriental Tower, people below will look very small.
| A．Stand | B．Standing | C．To stand | D．If you stand |