Add one of the following word to make each pair simple sentences into a compound or complex sentences (But, therefore, and, which, become)
1-my new assistant can type very well. he hasn't much experience with computer
2-I found useful acting website. I shared it with my friends
3-I left my bag on the bus. i didn't have a pencil
4-this is a great opportunity. i should not be lost
5-this soup was to cold. i warmed it the microwave