___________ she was chosen made us very happy.
| A．What | B．That | C．Why | D．How |
The air in big cities _____very dirty by factories.
| A．are often made | B．is often made | C．have often made | D．has often made |
The number of people invited _____fifty， but a number of them _____absent for different reasons.
| A．were； was | B．was； was | C．was； were | D．were； were |
All but one ____here just now.
| A．is | B．was | C．has been | D．were |
Father went to his doctor for ____about his heart trouble.
| A．an advice | B．advice | C．advices | D．the advices |
_____turn green in spring.
| A．Leaf | B．Leafs | C．Leave | D．Leaves |