The historicimpression on us．Every one of us thought their show was _________ a failure but a great success.

With the worldwide oil crisis, the price of oil has been raised ______ 15%

r their help, we ____ the program intime

It was 80 years before Christopher Columbus crossedthe Atlantic______ Zheng sailed to East Africa

ody has ______ responsibility to save water, iffuture generations are to enjoy _____ similarstandard of living to the one we enjoy now