Never before in China __________ so carefully concerned about the food safety.
| A．people have been | B．have people been | C．are people | D．people are |
The famous musician，as well as his students，________ to perform at the opening ceremony of the 2012 Taipei Flower Expo.
| A．were invited | B．was invited |
| C．have been invited | D．has been invited |
It was with the help of the local guide________the mountain climber was rescued.
| A．who | B．that |
| C．when | D．how |
It was not until near the end of the letter ________ she mentioned her own plan.
| A．that | B．where |
| C．why | D．when |
It was only after he had read the papers ________Mr.Gross realized the task before him was extremely difficult to complete.
| A．when | B．that |
| C．which | D．what |
Only when he apologizes for his rudeness________to him again.
| A．I will speak | B．will I speak |
| C．do I speak | D．I speak |