The hurricane damaged many houses and business buildings；_________，it caused 20 deaths.
| A．or else | B．therefore | C．after all | D．besides |
— In order to improve your English, you need to practice more.
— ______. Practice makes perfect.
| A．Certainly, go ahead | B．Well, it depends |
| C．I don’t think so. | D．I couldn’t agree more |
How the fire in the dancing hall started _________ a mystery.
| A．to remain | B．remains |
| C．is remaining | D．is remained |
Please don’t try to back out _____ everything has been arranged.
| A．until | B．though | C．when | D．unless |
Simon is very regretful. If he had been more careful, he _____ such a big mistake.
| A．hasn’t made | B．hadn’t made |
| C．won’t have made | D．wouldn’t have made |
______ by jeep, we visited a number of cities in South China.
| A．Traveling | B．Traveled |
| C．To be traveling | D．Having traveled |