Wecan never expect bluer sky unless we create lesspolluted world

Miss Li is ________ English teacher. _______ is a good teacher.

Henry will give us a report as soon as he _________ tomorrow.

The scientist’s many years’ careful observation ____ a surprising discovery.

________ by the heavy snowfalls, Chenzhou, a city in South China, was cut off from the outside,________ water and electricity shortage[ ]