Only after Mary read her composition the second time the spelling mistake.
| A．did she notice | B．she noticed |
| C．does she notice | D．she has noticed |
Doctors say that exercise is important for health,but itbe regular exercise .
| A． | can | B． | will | C． | must | D． | may |
We were astonished __________the temple still in its original condition .
A finding B. to find C. find D.to be found
.There are over 58,000 rocky objects in__________ space,about 900 of which could fall down onto earth.
| A．the rhe | B．不填 the | C．the不填 | D．a the |
We______________last night，but we went to the concert instead.
| A．have studied | B．might study |
| C．should have studied | D．would study |
Computers and mobile phones, playgh they are indeed making our life________and more________have reduced the need for face-to-face cotyr unication.（）
| A． | easily;effienenl | B． | easier;efficient | C． | easy;efficiently | D． | easily;efficiently |