The room is empty except for a bookshelf ________ in one corner.
| A．standing | B．to stand |
| C．stands | D．stood |
This is the hotel ________ last month.
| A．which they stayed | B．at that they stayed |
| C．where they stayed at | D．where they stayed |
What________ the public was that Phelps should take drugs.
| A．worrying | B．worried |
| C．was worried | D．was worried about |
The Red Army soldiers had to fight________ all kinds of difficulties in their fight________ the people’s freedom.
| A．for；for | B．with；with |
| C．against；against | D．against；for |
Some people fear that ________ air pollution may bring about changes in ________ weather around the world.
| A．/；the | B．the；/ | C．an；the | D．the；a |
Only when I left my parents for Italy________ how much I loved them.
| A．I realized | B．I had realized |
| C．had I realized | D．did I realize |