17．Puppy love is _________．
| A．there where Chinese parents have long been arguing |
| B．where Chinese parents have long been arguing |
| C．where do Chinese parents argue about |
| D．the place that Chinese parents argue about |
____________caused the accident is still a mystery.
| A．How | B．What | C．That | D．Where |
__from Adelaide to Darwin and you’ll observe some of Australia’s most beautiful landscapes.
| A．Traveling | B．To travel | C．Traveled | D．Travel |
It is in the year of 2010 a severe drought hits Yunnan province.
| A．until | B．that | C．before | D．when |
The sale usually takes place outside the house ，with the audience on benches，______chairs or boxes。
| A．having seated | B．to seat | C．seated | D．seating |
We still remember once__________round the famous tower when we were young.
| A．having taken | B．to be taken |
| C．having been taken | D．to have taken |