The first thing you must remember is that in order to succeed, it is almost compulsory that you ______ optimistic.
| A．be | B．are | C．must be | D．have been |
The rare fish，__________ from the cooking pot, has been returned to the sea.
| A．saved | B．saving |
| C．to be saved | D．having saved |
The policeman said the accident was __________ careless driving. Therefore, the driver had to pay for all the losses.
| A．due to | B．thanks to |
| C．led to | D．owe to |
__________ their timely help, we overcame the difficulties at last.
| A．Thanks to | B．Thanks for | C．As a result | D．Because |
Eating too much fat can __________ heart disease I and cause high blood pressure.
| A．attend to | B．devote to |
| C．distribute to | D．contribute to |
The river near our school has become clean again as new measures have been __________ to prevent it __________ any further.
| A．taken; polluting |
| B．taking; being polluted |
| C．taken; being polluted |
| D．taking; to be polluted |