She always come to our help when we get into trouble ____ she is very busy.
| A．since | B．once |
| C．even if | D．so that |
32. ____from Adelaide to Darwin and you’ll observe some of Australia’s most beautiful landscapes.
| A．Traveling | B．To travel | C．Traveled | D．Travel |
31. It is in the year of 2010 a severe drought hits Yunnan province.
| A．until | B．that | C．before | D．When |
30.Mr. Li arrived at the Wuguang train station twenty minutes ago, but the train to Guangzhou________yet.
| A．hadn’t come | B．won’t come | C．hasn’t come | D．didn’t come |
29. To pass the driving test, Alice had a busy month______driving the car.
| A．to practise | B．practising | C．practised | D．Practise |
28．How can they expect to learn anything________they never listen?
| A．when | B．until | C．unless | D．Though |