Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
| A．before | B．as |
| C．unless | D．in case |
Please tell me how the accident _______. I am still in the dark.
| A．came up | B．came out |
| C．came to | D．came about |
It is______ of him to set his aim high but do little, so he is always leaving things undone.
A. specific B. typical
c. flexible D. widespread
— Do you think it's a good idea to make friends with your students?
—________, I do. I think it's a great idea.
| A．Really | B．Hopefully |
| C．Actually | D．Eventually |
Mary couldn’t________ the terrible working conditions in that factory and resigned last week.
| A．catch up with |
| B．keep up with |
| C．put up with |
| D．come up with |
Some passers-by witnessed the car accident ______ five passengers were killed, a baby included.
| A．where | B．which | C．that | D．when |