______ at the top of the Oriental Tower, people below will look very small.
| A．Stand | B．Standing |
| C．To stand | D．If you stand |
I knew I should not accept anything from such a person but I found it difficult to turn down his ___.
| A．plan | B．offer | C．suggestion | D．request |
He was seen ______ a letter in his bed room.
| A．write | B．to write | C．written | D．wrote |
——Don't you think it's going to rain over the weekend?
——_______.
| A．I don't believe | B．I don't believe it | C．I believe not so | D．I believe not |
I found my home town completely ______.
| A．changed | B．changing | C．to be changed | D．to change |
Tom failed ______ the experiment yesterday.
| A．doing | B．did | C．to do | D．do |