The government has taken measures air quality.
| A．to improve | B．improved | C．being improved | D．to be improved |
They only hear while their hands and eyes are_________ occupied.
A other than B. no other than C. otherwise D. other ways
No sound and no voice______ for a while.
| A．have heard | B．has heard | C．has been heard | D．have been heard |
In America, ______ car is ______ popular means of transportation.
| A．the; a | B．a; the | C．the; the | D．the; / |
People think that ______ opening ceremony of the 29th Olympic Games is _____ great success.
| A．an; a | B．the ; a | C．the ;the | D．the ; / |
The Spring Festival is ________unique day for families. It is also _______ day for special foods like niangao.
| A．an, a | B．an, the | C．a, a | D．the, a |