题目内容：

Do you make friends1.(easy)? Do a wall-sit test and you’ll find out.

   Researchers at the University of Oxford did 2.study with 101 participants aged between 18 and 34. Participants first 3.(fill) out questionnaires about their social lives, and they were then asked 4.(press)against a wall with their5.(knee) at right angles(直角)for as long as they could,6.can be really painful.

   The results showed that the longer participants held the position, the bigger7.outer network---or distant friends they contacted once or twice a month—was. That was 8.the brain’s painkilling system is associated  9.both pain tolerance and social bonding, which means that the more active this system is, the10.(good) you are at both.