阅读下面短文，用括号内所给动词的适当形式填空，必要时可加助动词或情态动词 。
"Tom? Are you in bed yet?" called Mrs. Green.There was no answer. Mrs. Green put down her book and
went to her 14-year-old song room.Tom 1______(sit) in front of a bright computer screen on which a
motorbike was running fast.
"Oh, Tom.. How long 2______ you ______ (play) on that computer? You must stop now.it's half past
eleven.If you don't go to bed soon, you'll be very tired tomorrow," said Mrs. Green.
"But I've nearly won the game," said Tom to Mrs. Green. She 3______ (see) the excitement on his face.
She 4______ (sit) down beside him.You're always playing on the computer. You 5______ (spend) more time
on this machine than on your homework.
Today more and more families have computers. Parents hope computers can help their children 6______
(improve) their study at school.But, many of their children use computers to play games, to watch videos,
instead of 7______ (study). We often see that computer game houses 8______ (crowd) with people, especially
young boys.They spend a lot of money competing with the computerized machines.
The more they lose, the more they want 9______ (win). The result is that they don't want to work or study.
In some other countries, even scientists hate computers. They say computers cause millions of people to
lose their jobs or cause them a lot of trouble. Computer game addiction 10______ (be) a serious problem in
social life. Something has to be done to solve the problem.
=30°，如在三轴固结不排水试验中围压σ3=150kPa，破坏时测得试件中的孔隙水压力u=100kPa，问此时大主应力σ1为（）kPa。