Combine each pair of sentences, using in order (not) to / so as (not) to
1.She phoned me last night. She wanted to know the result of the examination
=>............
2.My mother went to the market. She wanted to buy food
=>............
3.He always drives carefully. He doesn't want to cause accidents
=>....  .......   
4.The man is practicing singing English songs.  He will take part in singing contest