16.It is the important decisions that the president makes.
17.I don't mind her criticising me,but it's how she does it that I object to.
18.It is a background check that a girl's parents often do on her boy friend in Italy.
19.It was the black car that the Smiths wanted to sell,not the new red one.
20.The lecturer can't know the reason for which many people gathered here.
II.
1.careful/sympathetic
2.excited
3.conserved
4.appearance
