I don’t become a serious climber until the fifth grade, ______ I went up to rescue a kite that was stuck in the branches of a tree.
| A．when | B．where |
| C．which | D．why |
A big earthquake hit Ludian in Yunnan, ________ many deaths and injuries and a big loss of property.
| A．to cause | B．caused |
| C．causing | D．having caused |
______ along with host families, I believe, language travel students are likely to get enough language practice.
| A．Stay | B．Having stayed |
| C．Staying | D．To stay |
Today we have chat rooms, text messages and email, but we seem _______ the art of communicating face-to-face.
| A．losing | B．to be losing |
| C．to be lost | D．having lost |
_________ to too much sunlight will do harm to your skin.
| A．Having exposed | B．Being exposed |
| C．To be exposed | D．Exposed |
（）There is no greater pleasure than lying on my back in the middle of the grassland, _____at the night sky.
| A．to stare | B．staring |
| C．stared | D．having stared |