What ________ pity that you couldn't be there to receive ________ prize!
| A．a；a | B．the；a | C．a；the | D．the；the |
—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 |
Criticism is highly necessary ____it helps to monitor the progress of our work．
| A．in which | B．for which | C．so that | D．in that |
In 1720,Bach’s wife suddenly died, ______him with four children．
| A．leaving | B．to leave | C．left | D．had left |
The front door ________ open．I'll have it repaired．
| A．mustn't | B．shouldn't | C．may not | D．won't |
___Obama was elected president of the USA is a big success for the blacks in America．
| A．\ | B．That | C．What | D．As |