完形填空。阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。
One night, I was driving down a two-lane highway, not very fast. Another car approached from the 1 direction at about my speed. As we passed each other, I caught the other driver’s eye for only a second, wondering whether he might be thinking, as I was, how 2 we were on each other at that moment. I was relying on him not to fall asleep, not to be put off by a phone conversation, not to cross over into my lane and bring 3 to a sudden end. Though we had 4 spoken a word to each other, he relied on me in just the same way.
