We should ______ all the figures and see if we have enough for the project.
| A．add | B．add to |
| C．add up to | D．add up |
While he was investigating ways to improve the telescope, Newton made______ discover which completely changed______man’s understanding of colour.
| A．a…不填 | B．a…the | C．不填…the | D．the…a |
（年(春)重庆市高三考前冲刺测试卷）2. For many, winning remains __ dream, but they continue trying their luck as there're always __ chances that they might succeed.
| A．/; / | B．a; the | C．a; / | D．the; the |
An accident happened atcrossroads a few metres away from bank.
| A．a…a | B．/ … a | C．/ … the | D．the…/ |
（年山东日照市高三校际联合检测）l.We can never expect____bluer sky unless we create_____less polluted world．
| A．a；a | B．a；the | C．the；a | D．the；the |
—I knocked over my coffee cup. It went right over _________ keyboard.
— You shouldn't put drinks near _________ computer.
| A．the;不填 | B．the;a | C．a;不填 | D．a;a |