We were having a meeting _________ suddenly someone knocked at the door.
| A．because | B．when | C．as | D．while |
You had better book rooms at the hotel in advance you should find no room on your arrival.
| A．so that | B．even if | C．in case | D．now that |
There are lots of problems in your hometown, but we're happy to see many of them________.
| A．are solving | B．are solved | C．have solved | D．are being solved |
Everyone is different and that is ________ makes our world so much better.
| A．that | B．which | C．what | D．who |
is recorded in the history book , Diaoyu Island has belonged to China since ancient times.
| A．As | B．That | C．Which | D．What |
Try to be independent, for your parents can't do __________for you all your life.
| A．something | B．nothing | C．everything | D．anything |