______________should be paid to our study,and only in this way ________make progress.
| A．Heart;we can | B．Mind;can we |
| C．Attention;can we | D．Notice;we can |
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 |
The headmaster ________for more than two weeks.
| A．has left | B．has gone | C．has been away | D．has come back |
The trees must _______three times a week.
| A．water | B．watering | C．be watered | D．waters |