6.We travelled on the 6：45 a.m.train to Boston，________arrived at 8：30 p.m.
7.The boys spent the whole morning________possible answers to the question.
A.discuss B.to discuss
8.It's a pity that some of the people________cannot come tO the party.
C.to invite D.were invited
9.It was________ matter that I had no choice but to talk it over with my parents.
A.a such serious B.a so serious
C.such serious a D.SO serious a
10.Jane isn’t feeling well today.I dare not do________ to upset her.
C.nothing D.a thing
11.More and more families have moved elsewhere because they cannot________the noise from the neighbouring airport.
A.come up with B.put up with
C.catch up with D.keep up with
12.Walk another block and cross the traffic lights，you will see the museum right________the left.
13.The Intemet users visiting our website are________young people between the age of 13 and 20.
C.mostly D.at most
14.No culture exists in________.It all comes from someplace.Ancient customs were modem one time.
15.There are several means of mass communication.The newspaper is' one.Television is________.
A.the Other B.the another
16.________the government agrees to give extra money, the theatre will have to be closed next month.
17.It is important to________ our awareness about environmental protection.
18.Seldom________ any mistakes during my past five years of service in the company.
A.I did make B.I would make
C.did I make D.would I make
19.I________ raw fish，but I’ d like to try it one day.
A.never eat B.never ate
C.was never eating D.have never eaten
20.Interestingly，many people hold the belief that imports are________ to domestic goods.
Every woman dreams of receiving a huge priceless diamond.Now space scientists 21________ that they have discovered the largest diamond in the universe.But it’s well 22________ the reach of the most loves truck men because it's 50 light years away, to be 23________.
Measuring 2,500 miles across and weighing five million trillion pounds，the rock Was found on Valentine’ s Day 24________ in the core of a white dwarf star, and it has excited the 25________ world.
“It’s the mother of all diamonds，”said Travis Metcalfe，26________ led the team of researchers at the Harvard-Smithsonian Centre，“and you would need a jeweler’S loupe(专用放大镜)，the size of the Sun，to 27________ this diamond.”
The largest diamond 28________ on earth was the 3，106-carat(克拉)Cullinan.It Was cut 29________ nine major stones，including the 530-carat Star of Africa，now a part of the Crown Jewels.Diamonds were 30________ discovered in India more than 2,800 years ago.The Ancient Romans 31________ that the stones were broken pieces of stars that had 32________ to earth.In Ancient Egypt，diamonds were used in funerals. In the Middle Ages，men 33________ them to symbolize their courage and strength.The 34________ of giving them as presents dates from 1477，35________ Maximilian，the prince of Austria, gave a diamond ring to Mary of Burgundy.