Complete each blank with ONE given word. There are more words than needed

Part 1: Complete each blank with ONE given word. There are more words than needed
1. ....................... the afternoon, they went boating and had a picnic on the river bank
2. You dont like playing in computer games,......................... you?
3. She told me that she would visit her grandparents the year.....................
4. Plastic bagswill cause pollutiom ................................. they are very hard to dissolve
5. Auld Syne is a song .................................... is sung on New year's Eve.
    do         so          after           before         in           if         because         which