The world today different without the amazing discoveries produced by great scientists.
| A．were | B．had been |
| C．would have been | D．would be |
—Look at those clouds!
—Don’t worry.___it rains,we’ll still have a great time
| A．Even if |
| B．As though |
| C．In case |
| D．If only |
You can borrow my car___you promise not to drive too fast
| A．unless |
| B．even if |
| C．in case |
| D．as long as |
All the photographs in this book,___stated otherwise,date from the 1950s
| A．unless |
| B．until |
| C．once |
| D．if |
Hot___the night air was,we slept deeply because we so tired after the long journey
| A．although |
| B．as |
| C．while |
| D．however |
A number of high buildings have arisen___there was nothing a year ago but ruins
| A．when |
| B．where |
| C．before |
| D．until |