【题目】Armstrong joined the navy in 1949 and served _______ a pilot for three years.

【题目】Mary chatted with a friend of on WeChat for a long time last night.

【题目】With the ______ progress in high technology, 5G has come into our life. (迅速的)

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【题目】From this story we know that nobody can be successful _______ any efforts. (没有)

【题目】There is no _______ that we will realize our dreams in the end. (疑问)

【题目】Never _______ your life with others'. Every dog has its day. (比较)

【题目】To our surprise, the missing dog came back home _______(独自).

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