So difficult_____it to acquire a large vocabulary without the help of a teacher that he was close to giving up .
| A．he have felt | B．have he felt | C．he did feel | D．did he feel |
Only when I left my parents for Italy ______ how much I loved them.
| A．did I realize | B．I realized | C．had I realized | D．I had realized |
Dogs have a very good_____ of smell and are often used to search for survivors in an earthquake.
| A．view | B．means | C．sense | D．idea |
She is an excellent student in our class, and she always herself in her studies.
| A．hides | B．buries | C．covers | D．leaves |
In that big earthquake all their houses were , so they had to build new ones.
| A．hurt | B．harmed | C．injured | D．destroyed |
never to come back before he could make a big fortune, Mike left home without saying a word.
| A．Determining | B．Determined | C．Being determined | D．Decided |