题：Fill in the blanks with because ,so or but
1.My mother told me to take an umbrella with me ( ) it might rain in the afternoon.
2.He has moved to another city,( ) we write to each other from time to time.
3.I bring a swimsuit,( ) I can swim in the sea.
4.It can be warm in the morning,( ) soon it will become cool.
5.Let's stay for a long time( ) there are a lot of things to see.