选词填空：根据短文内容，用方框中所给词的恰当形式填空，每个单词限用一次。
help    careful    love    flower   yourself
Some of my classmates     their mothers with housework last Mother’s Day.
Others bought some     for their mothers.
“Why not make a birthday card by     to show your love?”my father said to me.
Then I went to my room to make a birthday card    .
I wrote in the card, "I _  you, my dear mother！"