I greeted the teacher with “ hello”, and the teacher gave me a sweet smile ______.
| A．by turns | B．in return |
| C．in turn | D．for turn |
On June 16, 2012, it arrested the world’s attention ______ Shenzhou 9 spacecraft was successfully sent into the sky with the first Chinese woman astronaut.
| A．that | B．what | C．if | D．why |
New traffic rules that took effect on January l, 2013 are much stricter______ than in the past．
| A．that | B．this | C．those | D．what |
Rock climbing is ___ great fun. You will get close to ____ nature and take adventures at the same time.
| A．/; / | B．a; / | C．a; the | D．/; the |
— 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 |