阅读下面的短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处最佳选项。 The eyes are one of the most expressive instruments of body language.
Keith，seventeen，from Montclair New Jersey，learned the hard way about one1the eyes can make .“I had a2who graded heavily on classroom discussion,”
Keith says. “He seemed to have a strong ability to know just when I didn't have the 3.I couldn't figure out how he could be so 4.Then it dawned on（为……所明白）me.5 I didn't know the answer，I would avoid looking at him
When I6know what so say，I always7straight back at him.
From that moment on，I 8myself to look him in the eye,9 I knew the work or not.
That trick has saved me a lot of trouble.”
Many people，including some policemen，believe eye contact is a good10of honesty.
If someone can't look at you directly in the eye，then he or she is not playing 11,they insist.
After many experiments,12,a number of experts have found out that good liars can make false eye contact.
Eye contact，though not a（n）13 sign of honesty，is a clear way to show interest in another person.
When a person looks at you and 14to do so，you know his15is placed on you.
When he turns his head away，his mind is probably16.17 there are exceptions.
A 18person may have trouble making and keeping eye contact，no matter how interested he is in the other person. And certain 19,such as the British and Germans，are much20oriented（适应）to eyeball to eyeball contact than，say，the French and Arabs.
