IV. Join the pairs of sentences together by using given connections
1. I was busy all day. I couldn’t go to the football match. (so)
=> I was busy all day so I couldn’t go to the football match. 
2. I’m tired. I stayed up late watching TV. (because)
=> I’m tired because I stayed up late watching TV
3. Hoa failed her math test. She has to do the test again. (therefore)
=>Hoa failed her math test therefore she has to do the test again.
4. She is very tired. She has to finish her homework before she goes to bed. (however)
=> However she is very tired, she has to finish her homework before she goes to bed.