根据下列句子及所给首字母，写出单词的适当形式，每空一词。
小题1:We have three m________ a day. They are breakfast, lunch and supper.
小题2:They took quite a f_______ photos in Guizhou.
小题3:I d_______ playing computer games. I think they are boring.
小题4:I exercise t________ a week, every Wednesday and Friday.
小题5:It is sunny today, so it is not n_________ for you to take an umbrella.
