Thank you for sending us _____ fresh vegetables．You have done us _____ great service．
| A．the; a | B．不填; the | C．不填; 不填 | D．the; 不填 |
The place __ the bridge is supposed to be built should be ____the cross-river traffic is the heaviest .
| A．which; where | B．at which ;which | C．at which ;where | D．which ;in which |
Mary wrote an article on ____the team had failed to win the game .
| A．why | B．what | C．who | D．that |
After Yang Liwei succeeded in circling the earth ,_______our astronauts desire to do is walk in space .
| A．where | B．what | C．that | D．How |
we can not figure out ____quit a number of insects ,birds ,and animals are dying out .
| A．that | B．as | C．why | D．when |
He was chosen _________ of the company.
| A．manager | B．a manager | C．the manager | D．as a manager |