At times the balance in nature is____, resulting in a number of possibly unforeseen effects.
| A．confused | B．puzzled | C．disturbed | D．troubled |
– The contest is drawing near, and I feel very nervous.
-- ______. So long as you try your best, it doesn’t matter whether you win or not.
| A．Take your time | B．Take it easy |
| C．Don’t mention it | D．It’s hard to say |
After three days’ waiting, there was a little doubt in Jake’s mind______ the police could find his lost car.
| A．how | B．that | C．where | D．whether |
______ your opinions are worth considering, the committee finds it unwise to place too much importance on them.
| A．As | B．Since | C．If | D．While |
He is confident, ______, in my opinion, is most important in modern society.
| A．who | B．that | C．which | D．what |
The team, ______ to climb the world’s second tallest mountain twice, finally decided to give up.
| A．having attempted | B．attempting |
| C．attempted | D．to attempt |