Those black clouds are a sure _____ that it’s going to rain.
| A．thing | B．mark |
| C．sign | D．one |
Finding a new job as an operator was the reason _______ I moved.
| A．at that | B．in which | C．on which | D．for which |
Peter went to a concert _______ his favourite band played and sang.
| A．which | B．for which | C．at which | D．in which |
I like my music teacher ______ I have great respect.
| A．whom | B．for whom | C．to who | D．who |
Those who want to say anything more _________ your hands and then_______ to speak.
| A．rise; raise | B．raise; rise | C．raise; raise | D．rise; rise |
Rainforests ____ and burned at such a speed that they will disappear from the earth in the near future.
| A．cut | B．are cut | C．are being cut | D．had been cut |