He _____ his potential had it not been for his desire to meet new challenges.
| A．would never have realized | B．would never realize |
| C．never realized | D．had never realized |
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 |
She is the only one among the _______ writers who ______ stories for children.
| A．woman; writes | B．women; write |
| C．women; writes | D．woman; write |