Never before _________ available for quick and easy acess in so many different fields of study.

单项选择题To sell the house , we made a __________ to the buyer by agreeing to put a new roof on it.

单项选择题____________ school policy , the students had a holiday between Chritmas and the New Year.

单项选择题Written to be performed on a __________,Thornton Wilder’s play Our Town depicts life in a small New England community.

单项选择题The new CEO asked that all inter-office communications ________ in writing rather than in person , _________ possible.

单项选择题Surveys show that the majority of passengers are pleased that an agreement has been reached to forbid smoking on _________ flights within the continental United States.

单项选择题As the market was _________ goods, the economy became more balanced , and inflation went down.

单项选择题If you have not signed a contract, you are under no _________ to pay them any money.

单项选择题_________very familiar with inspection reports, I realized that some pages of this one were missing.

单项选择题_________a well-balanced diet,________adequate sleep ,is needed for good health.

单项选择题Accustomed to the coffee from Columbia________Governor John said that ________coffee should always be strong.