—You may find the key to the math problem on page 107.
—Ah, it’s so simple. I wonder why I _____ of that.
| A．hadn’t thought | B．haven’t thought | C．didn’t think | D．wasn’t thinking |
I’m having a party next Saturday；put it __________ in your diary so you don’t forget.
| A．aside | B．away |
| C．down | D．on |
Every time __________ I called on him，he was very busy.
| A．during | B．when |
| C．in which | D．/ |
It took __________ building supplies to construct these energysaving houses.It took brains，too
| A．other than | B．more than |
| C．rather than | D．less than |
__________ we could afford it，we wouldn’t go abroad for our holiday.
| A．As if | B．As though |
| C．Even though | D．Even so |
I wish I __________ able to tell him all about it last night.
| A．should be | B．were |
| C．had been | D．was |