Working hard is not only a_____ of a great success, but is among the essential requirement.
| A．sign | B．signal | C．guarantee | D．marks |
When delivering a speech, you should adjust your language to the age of your ______ audience.
| A．target | B．entry | C．boundary | D．concept |
Is this the reason _____ in the report for her success in the job ?
| A．she explained | B．what she explained |
| C．how she explained | D．why she explained |
The extra room _______ very useful when we had visitors.
| A．was proved | B．proved | C．has been proved | D．has proved |
I ‘ ll help you_________.
| A．as much as I can | B．as possible as I can |
| C．as many as possible | D．as many as I can |
Hello, I _______ you ______ in London. How long have you been here?
| A．don’t know; were | B．hadn’t known; are |
| C．haven’t known; are | D．didn’t know ; were |