强调下列句子括号中的部分
1（The well known chinese cuisine）has a long history
2 This food manufaceture has supplied the market with (sugar free food )
3 she did not finish (the course at college) because of her illness
4she did not finish the course at college (because of her illness)
it is the well known chinese cuisine that has a long history
it is sugar free food that this food manufaceture has supplied the market with
it is the course at college that she did not finish because of her illness
it is because of her illness that she did not finish the course at college