and, or, but ,although , so ,because, when..
1.__ Mr so was walking in th park, he met his old friend.
2.The weathre is very nice today___ I don't want to go out.
3.Please give Ryan a sandwich___ a hot dog.he is very hungry.
4.May laughs all the time ___she is a cheerful person.
5.The students are having a long holiday___ they are very excited.
6.Mrs Au is cooking ___talking on the phone at the same time.