题目

Being alone in outer space can be frightening. That is one reason why astronauts on solo（单独的） space flight were given plenty of work to keep them  21   . They were also in constant communication with people on the earth .   22 ,  being with people from whom you cannot get away might be even harder than being alone. This is what happens on long submarine（潜水艇） voyages. It will also happen on  23  space flights in the future. Will there be special problems of adjustment under such conditions?Scientists have studied the reactions of men to one another during long submarJohn Brown is London taxi driver who love going to the       76.________ Theatre .Last week his mother gave him two tickets for a play.        77.________   The tickets were on Sunday evening. Then John read some             78._________ Reviews of the play, which all said it was a terribly one! He             79__________.   Wouldn’t go to see a play that no one liked it, So two hours           80._________    Before the play started, he left the ticket on the back seat of              81__________.  His taxi, Perhaps someone who wanted ∧  see the play would take   82. _________   Them. However, while John went back home, the tickets were         83.__________        Still there. In the fact ,there were four tickets on the seat.                 84.__________     Someone has placed another pair of tickets on top of them!               85__________.