Charles Babbage is generally considered __ the first computer.
| A．to have invented | B．inventing | C．to invent | D．having invented |
Such a great event __________ that it will attract governments and people from across the world to Shanghai．
| A．is World Expo 2010 | B．World Expo 2010 is |
| C．has World Expo 2010 been | D．World Expo 2010 has been |
________spending our vacation in the city，why not try hiking in the courtry?
| A．Instead of | B．In favour of | C．In case of | D．In terms of |
— We should recycle everything we can．
— Absolutely．These may seem little things，but they’re not__________it comes to saving the
environment．
| A．since | B．when | C．while | D．as |
No ready technical data was ______________，but we managed to go without．
| A．believable | B．convenient | C．available | D．accessible |
Every solid object______reflect a sound，varying according to the size and nature of the object．
| A．must | B．shall | C．will | D．should |