请根据括号中的中文提示、英文释义或句意，写出句中所缺单词，使句子通顺。
【小题1】Do you have any difficulty solving suggestions whether attended accept (解决) the problem?
【小题2】Thank you for giving us some solving suggestions whether attended accept (建议) which are so valuable to us.
【小题3】I doubt (if) he will attend the meeting tomorrow.
【小题4】 Plenty of pop stars (take part in) the presentation last week.
【小题5】Mr. John received an expensive birthday gift from his friends, but he decides not to it.
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