Everybody has _____ responsibility to save water, if future generations are to enjoy
____ similar standard of living to the one we enjoy now.
| A．the; / | B．a; a | C．/; the | D．a; the |
I had walked a few steps _______ I realized that I was lost in the thick fog.
| A．unless | B．Before | C．When | D．since |
His idea of having weekly family meals together, which seemed difficult at first, has _______ many good changes in their lives.
| A．got through | B．resulted from | C．turned into | D．brought about |
There is no possibility, I guess,________ our exam will be put off.
| A．what | B．Which | C．that | D．whether |
Professor Smith, along with his assistants, _______ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
I have $20 000 and I need $25 000,but my parents have promised to _______ the difference.
| A．work out | B．come up | C．give out | D．make up |