In 1947 the pilot of a small aeroplane saw nine strange objects in the sky over Washington. He said that they looked like    21   . Newspapers printed his story under the   22    "Flying Saucers".

Since then, all over the world, people have  23    seeing similar strange objects. No one knows  24   they are or where they come from. Some people say that they do not   25  , but many others say that they have seen them. Usually people on the ground have seen them  26  not always. Airline   27    also have reported seeing them and so have   28    ── the men who fly in spaceships.

Perhaps some people saw them only in their   29  . Perhaps some people made a mistake. But airline pilots and astronauts do not usually make   30    of this kind. Captain Ed Mitchell, who was the sixth man to  31    on the moon, said in 1974 that he believes that some "flying saucers" are  32   . Many other people now believe that these   33    flying objects are visiting the   34    from other worlds in space.   

The American government   35    to find out more about these objects. It listened to a great many people who said they had  36   them. But the Government Committee could not decide on what the objects were. It called them UFOs, which is   37   for "Unidentified Flying Objects".

In 1964, a driver of a police car in New Mexico saw a UFO landing a mile away. When he reached it, there were two small figures   38    near it. They looked like little men. When he reported on his radio, they got inside the object and   39  away.

There are many other   40   stories. Some are probably untrue but some may be true. No one knows.

____ the youth to the rising sun at 8 or 9 o'clock a.m., Mao Zedong expressed his great hope for the young men.

A. Compared      B. to compare        C. Compare         D. Comparing

 After months of voyage, Columbus arrived in_____ later proved a new continent.

A. where                      B. what              C. which              D. that

 ---You seemed to have been impressed by his songs.

---Well, not exactly so. It was his way of singing______ his voice that really impressed me.

A. rather than              B. other than               C. together with            D. but also

The truth, Sir, is that the old man____ across the street when my car hit him.

A. was to walk                                 B. had been walking      

C. was walking                                 D. walked

--- Why do you go to work by bus?

  --- Because my car_____.

A. has repaired                                          B. has been repaired

C. was repaired                                         D. is being repaired

To his surprise, his new film well ____ by the public in China, met a cold welcome abroad.

A. accepted       B. was accepted        C. to accept                  D. accepting

What a unforgettable experience! I’ll write it down______ it is still fresh in my memory.

A. since                B. while            C. after               D. until

In this factory, suggestions often have to wait for months before they are fully __.

A. considered         B. admitted             C. absorbed               D. acknowledged

--- He can’t have finished his homework last night, __________he?

--- No. You see, he is busy doing it now.

A. has                          B. may                       C. can                     D. did