Miss Li ________ as a biology teacher for fifteen years in our school, and now she is Party secretary of our city.
| A．has worked | B．worked | C．had worked | D．works |
Helen always helps her mother even though going to school ______ most of her day.
| A．takes up | B．makes up | C．saves up | D．puts up |
We regret to inform you that there are no tickets ______ for Friday's performance.
| A．available | B．useful | C．convenient | D．affordable |
Mr.Wang ______ two boys to send the sick boy to the nearest hospital.
| A．arranged | B．has arranged | C．had arranged for | D．has arranged for |
My teacher's rich knowledge of science ______ my decision ______ study science.
| A．influenced；to | B．influenced；on |
| C．has influenced；with | D．influences；on |
There is reason to believe that most writers have difficulty in ______ the opening paragraphs of their papers.
| A．constituting | B．constructing |
| C．comprising | D．founding |