_)I had not believed in falling in love with somebody at first sight_______I met David on Valentine’s Day three years ago.
| A．when | B．unless | C．if | D．before |
________ the new life in Qingdao，the old man lived happily with his son.
| A．Accustomed to | B．Accustoming |
| C．Having accustomed to | D．Having used to |
It has been raining for nearly one week，________ the river rise a lot.
| A．making | B．makes |
| C．made | D．to make |
—Can you help me with this problem?
—It's beyond my __________.I didn't work it out, either.
| A．strength | B．ability |
| C．energy | D．force |
To win in these areas, the firm needs a sustainable __________ advantage.
| A．competitive | B．active |
| C．attentive | D．sensitive |
—The hotel business in China is as __________ as that in developed countries now.
—Yes, but we still have a long way on energy saving hotels.
| A．innocent | B．curious |
| C．perfect | D．mature |