64. The hut was dark so it took time for our eyes to __________(适应).
63. It was my first visit to a r___________(偏远的) village, a village as far away as you can imagine.
62. When I was teaching the boys, I sometimes wondered how _____________(相关的) chemistry is to these students after they left school.
61. Dear Rosemary, thanks for your letter, which took a _____________(两个星期) to arrive.
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