.____ the temperature falling so rapidly, we couldn't go on with the experience.
| A．Since | B．With | C．As | D．For |
With the help of the firefighters ,the workers managed to escape from burning mine , ___________.
| A．hungry and frightened | B．hungrily and frightening |
| C．hungry and frightening | D．hungrily and frightened |
According to a new study by a British’s university , learning ______ second language can lead to ________ increase in your brain power.
| A．a ; the | B．不填；the | C．a ；an | D．the ；an |
To succeed in a difficult task ,______________.
| A．Persistence is needed | B．Persistence is what you need |
| C．One needs to be persistent | D．A persistent nature is needed |
We’ll buy a11 the products in your storehouse, ______ of course the price is reasonabte．
| A．provided | B．unless | C．though | D．until |
---_____ the letter on your way to office.
---OK. I _______.
| A．Don’t forget posting; will | B．Do remember to post; will |
| C．Do forget to post; do | D．Do remember posting; do |