单项选择;从每小题A、B、C、D中选出一个能填入句中空白处的最佳答案。
Sam is doing some _______ about the ancient Silk Road.
A. exercise B. operations C. research D. experiments
C
—Did you enjoy _______ in Chengdu last week?
—Yes, I had great fun there.
A. myself B. yourself C. ourselves D. themselves
B
While traveling in a strange place, you'd better _______ the local people and follow their customs (习俗).
A. watch B. change C. control D. teach
A
As soon as I heard the news that I passed the driving test, I felt _______ at once.
A. angry B. relaxed C. afraid D. nervous
B
A woman stood ______ the window, watching the children playing games in the garden.
A. past B. through C. across D. by
D
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