Children’s brains can’t develop properly_______ they lack protein(蛋白质).
| A．when | B．since | C．because | D．unless |
6. I like _____ in the autumn when the weather is clear and bright.
| A．one | B．that | C．/ | D．it |
5. Great changes have taken place in that college. It’s no longer _____ it was 20 years
ago, _____ it was so poorly equipped.
| A．what; when | B．that; which | C．what; which | D．when; that |
4. Though having lived abroad for years, many Chinese still _____ the traditional
customs.
| A．survive | B．observe | C．possess | D．Support |
3. It had been half an hour before she found herself _____ in the wrong direction of
her home.
| A．walking | B．to walk | C．walked | D．Walk |
2. It’s fascinating to see _____ different people approach the problem.
| A．what | B．which | C．how | D．that |