The gravity on the earth is much ______ that on the moon, do you know why?
| A．as strong as | B．strong than | C．so strong than | D．stronger than |
Would you please speak more slowly? I can hardly ______ you.
A. talk with B. agree with c. follow D. hear
The factory has been ________ for two years.
| A．open | B．to open | C．opening | D．opened |
Paris is ______ most beautiful city, where you can see ______ famous Eiffel Tower.
| A．a, the | B．a, / | C．the , an | D．/,the |
--Where' s Mr Green? --Oh, he _________ Canada.
| A．has been to | B．has gone to | C．went to | D．was in |
Beyond _______ stars, the astronaut saw nothing but ________ space.
| A．the ,/ | B．/, the | C．/,/ | D．the ,the |