Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.

A three-year independent investigation into the September 11, 2001 attack on the Pentagon has yielded new eyewitness evidence which, according to the Southern California-based researchers who conducted the investigation conclusively (and unfortunately), establishes as a historical fact that the violence which took place in Arlington that day was not the result of a surprise attack by suicide hijackers, but rather a military black operation involving a carefully planned and skillfully executed deception."
A CNN Reporter at the scene states that there is no evidence that a 757 hit the Pentagon.
　  What hit the Pentagon? A Boeing 757 loaded with passengers and fuel right? Who was on Flight 757? According to the Flight Information there were No Arabs on it. That makes me wonder if Flight 757 actually existed at all.
　　From the pictures and the videos, people can find that there are several doubtful points that need to be taken into consideration, for example the marker line on the grass in the satellite and ground pictures, the different colors of the smoke, the hole which the plane impacted, and the standing pylons (架线塔).
　　Also, from the comparison of the different pictures, people can find some other strange points. For example, the gear (齿轮) is not the matching one. The wreckage of the plane is not the one from the American Airlines. The glass on the pavement of the pole is another doubtful point. The last thing that need considering is about the collapse. One of the gif video shows the plane impacting the Pentagon. The only problem with this video footage is that it has been altered (改变) and can not be fully trusted.
　　These crash photos and videos shown here clearly have been doctored (篡改) and don't even match the physics of what happened. So where is the real video? It leaves me many questions. Is this a missile? It is a real enigma.
【小题1】Where can you possibly read this article?

—Why are you late again?

—I’m sorry, but the lift had broken down and I was ________ inside.

A. injured　　　　　　　　　　　　　　　　　　　　　 B. trapped

C. protected　　　　　　　　　　　　　　　　　　　 D. blocked

I feel sure that ________ qualification， ability and experience，you are the most qualified one to do the job.

Tuesday the twelfth was my birthday. I  16 a day of cake and presents  17__     it turned into a day of mystery(神秘). Someone sent a bottle with a letter and a treasure map   18 . It said there was a treasure of over 20 million dollars. I didn’t know if it was a trick(恶作剧) or if I should   19  it. If it was   20  , it would be the best present I had ever got. I decided to  21 . Two of my friends came and we rented a truck.   22 , I thought about turning back twice during this trip, but I didn’t think it was a 23 decision for me to make. I   24 to give this trip twice the effort(努力) I had been putting in. This would take all my trust in order for me to find the  25  .
“The map says you have to turn when you see a large stone with a red circle,” said one of them.
“What do we do after the turn?” I asked   26 .
“It says we should see a tree. We are   27  to turn 20 meters north of it and dig.　
We got there and dug. We had   28  at first digging but we got better and worked very   29 . My trousers were dirty but I kept digging   30  I hit something. It was a large metal box. We   31  the lock and looked inside. There was a letter. It read:
　　“The lesson you have learned will be very   32  . If you put as much   33 in anything you do as you did in finding the   34  , you will have found the key to making over 20 million dollars.”
　　This was a trick from my parents. I thought I would never forget this   35    birthday present.