He ＿＿＿articles for our wall-newspaper these three years, and he ＿＿＿about forty articles.
| A．has been writing； has written | B．has been writing； wrote |
| C．is writing； has been writing | D．has written； has written |
___Mr. Chen is waiting outside to speak to you. He appears to be quite ___ important person.
| A．/, an | B．A, an | C．The, the | D．The, / |
Suan! Where have you been? You have no idea ___ worried I was !
| A．how | B．what | C．that how | D．what |
___ my opinion, Americans eat too much meat.
| A．in | B．over | C．on | D．above |
Most Saturday evenings they cook meals ___ open fire outside.
| A．in | B．over | C．on | D．above |
_____ in the queue for half an hour,Tom suddenly realized that he had left his wallet at home.
| A．To wait | B．Have waited | C．Having waited | D．To have waited |