When you come into the exhibition hall，you can see a large board with a notice on it，saying visitors__________not to touch the exhibits.
| A．will request | B．request |
| C．are requesting | D．are requested |
Weifang you see today is quitedifferent city from what it was 10 years ago.
| A．The; a | B．/; a | C．The; / | D．A/ a |
Sitting under the willow trees ____ an old man.
| A．is | B．are | C．is there | D．are there |
It was with the selfless help of our teacher ______ we realized our dream.
| A．that | B．who | C．when | D．how |
To build a harmonious society, we all have a part to play in the fight ____ injustice, unemployment and crime.
| A．over | B．by | C．for | D．against |
This chemical material is very toxic. So put it ______ the children’s reach.
| A．by | B．beyond | C．within | D．from |