好急..英文高手幫我睇下...

Decide whether the connectives below are used to join two sentences(S)or words(W).Write suitable letters to represent the answers.
1.They had a dog called Blackie which they loved,(but) they could not take him abroad.
2.They tried to look for a good place to leave him (while) they were away.
3.They wanted to fish (and) began to dig for worms.
4.(When) he reached home wath the dog,he gave it a home.
5.He put the coins in his pocket (and) turned to leave.