The train CRH380A, ___ trial operation on the Shanghai-Hangzhou high-speed railway, set a speed record of 416．6 kilometers per hour．
| A．started | B．to start | C．starting | D．being started |
23．In view of lacking preparations for the competition and not wanting to lose face, Johnson eventually decided to _____．
| A．drop in | B．drop off | C．drop back | D．drop out |
22．Shylock, how can you hope for mercy yourself when you show _____．
| A．it | B．nothing | C．none | D．no one |
21．The doctor couldn’t answer the question _____ the patient could survive that night．
| A．if | B．that | C．whether | D．What |
20．---I got up at five this morning, I thought it was Friday．
---You _____ so early．It is Sunday today; you don’t have to go to work．
| A．mustn’t have got up | B．needn’t have got up |
| C．needn’t get up | D．mustn’t get up |
19．He says he really can’t _____ to wait another day．
| A．waste | B．afford | C．spare | D．Pay |