如果把3：5的前项加上6，那么要使比值不变，后项应加上______或乘______．

根据首字母及句意补全单词  

1. You can find the correct date of Christmas on the c        .

2. Mary v      her cousin and h      a piano lesson yesterday.

3. I'm glad to come to your birthday p       .

4. -Can you come to my home for dinner?

    -S        , I'd love to.

5. I’m s        . I can't come to the football match with you.