Professor Smith and Professor Brown will _____ in giving the class lectures.
| A．exchange | B．alter | C．shift | D．alternate |
studying abroad can be hard, it can broaden your understanding of the word.
| A．If | B．While | C．Because | D．Since |
The problem wasn’t hard. The little girl worked it out quickly.
| A．that | B．much | C．enough | D．a little |
Jane accidentally where she had hidden the birthday present for her mother.
| A．turned out | B．let out | C．came out | D．took out |
An earthquake happened in Haiti on Jan.12,2010, many countries in the world paid close attention to.
| A．where | B．when | C．which | D．what |
The other day he ran across one of his friends on the street, whom he for ages.
| A．hadn’t seen | B．didn’t see | C．hasn’t seen | D．doesn’t see |