They have _________ a plan for reducing the daily outcome, which is quite practical.

A. put off          B. put away       C. put down       D. put forward

 He couldn’t make his voice ______ .

A. hear           B. be heard        C. hearing        D. heard

________ is impossible for us to offer him any help.

The school has ________ a plan for the committee to consider.

 A. set up          B. set aside       C. come true      D. come into being

It was not until 1999 ________ regular radio broadcast began.

A. while             B. which            C. that              D. since

--Now, where is my purpose?

--________! We will be late  for the picnic.

A. Come on           B. Don’t worry      C. Take your time     D. Take it easy.

 _______ we get good weather it will be a successful holiday. Which is wrong?

A. So long as       B. Provided that        C. So long          D. On condition that

There ______ quantities of apples in the basket and there was ______ milk in the bucket.

A. were; a number of             B. was; quantities of

C. was; a good many             D. were; a quantity of

You don’t mean any harm. You’re just trying to have a good time. But do you know how your overseas vacation    21   people in other countries? What’s your dream vacation? New chances are opening up all the time to   22  the world. So we visit travel agents, compare prices and pay our money. We know   23   our vacation costs us.     24   unfortunately, tourism often harms the local people   25  it helps them. For example, in Zanzibar, a British company got 57 sq km of land from the government for tourist sites（旅游胜地）. They include 14 luxury hotels, three golf courses , swimming pools and an airport. The local people fear   26    their farmland and fishing rights. And most of the profits（利润） do not help the local people.  27   , profits go for the tour operators in wealthier countries. When the Massey people in Tanzania were driven from their lands, some moved to city slum (贫民区),   28   now make a little money by selling small gifts. Removed  from their hunting lands, the Indians have no choice   29  their culture. Problems like these were observed more than 20 years ago. Now people are working together to correct them. Tourists, too, are  30   the pressure. The beginnings are small,   31  , but the results are obvious. The good news is that everyone,   32  can play a part to help the local people in the place we visit. Tour operators and companies can help by making sure that local people work in good   33  and earn reasonable wages. They can make it a point to use only locally   34  hotels, restaurants and guide services. They can share profits fairly to help the local economy. And they can involve the local people  35   planning and managing tourism.

If only I _____ how to operate an electronic computer as you do.

A. had known                B. would know           C. should know              D. knew