You have to be accurate in this job, because a small mistake can make a big .

____ has helped to protect the environment is worth praising.

We can’t _____ the fact that there is still a long way togo before we can get rid of pollution. [ ]

The days are gone _____ physical strengthwas all you needed to make a living.

rd came, as expected, ______ college entrance English exam will be reformed soon.