My early_______ at learning playing the piano was a failure although I took a fancy to it.
| A．attempt | B．effort | C．assumption | D．intention |
John decided that he had to do something to _______ his anger .
| A．let off | B．give off | C．give out | D．send out |
If we keep wasting so much energy, _____are that our oil wells will dry up and the environment will be destroyed.
| A．problems | B．difficulties | C．questions | D．chances |
— Where is my English book?
— I brought it to you _____you were in hospital yesterday afternoon.
| A．since | B．if | C．once | D．while |
The nutrients in _____falls into the ocean quickly become available to other living creatures.
| A．whatever | B．whichever | C．that | D．wherever |
Don’t forget where the emergency exits are _____an emergency.
| A．in place of | B．in favor of | C．in case of | D．in charge of |