After months of voyage, Columbus arrived in later proved a new continent.
| A．what | B．where | C．that | D．which |
On average, these footprints are 14 to 18 inches long, 5 to 9 inches wide and much larger than _______ of a human.
| A．that | B．it | C．those | D．one |
Young as he is, David has gained _______ rich experience in _______ society.
| A．the；the | B．a ； / | C．/ ； / | D．/；the |
--- Tom, how about going for a picnic this weekend?
--- _________. I love getting close to nature.
| A．I’m afraid not | B．I couldn’t agree more |
| C．It’s well done | D．I don’t think so |
I was really anxious about you. You ______ home without a word.
| A．mustn’t have left | B．shouldn’t have left |
| C．couldn’t have left | D．needn’t have left |
Wilma became the first American woman to win three Olympic gold medals in track, ________ made her mother very proud.
| A．it | B．that | C．which | D．this |