—What’s that noise? Is the water still running?
—Oh, my god! I ________to turn it off after I brushed my teeth．
| A．was forgetting | B．forgot | C．had forgotten | D．am forgetting |
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 |
The lake is calm and clear, and one of the things that _____in the water is the famous tower.
| A．reflects | B．reflect | C．is reflected | D．are reflected |