I.Choose the correct item.
1) We are very worried ............. Tom.
a) about b) for c) at
2) This is the boy ................. father is a mayor.
a) whose b) who's c) who
3) You cannot win a .............. if you don't even participate.
a) price b) reward c) prize
4) ……...... to contact John for a week, but in vain.
a) am trying b) I have tried c) have been trying
5) The air ............. by a factory when I lived there.
a) is polluted b) polluted c) was polluted

II. Put the verbs in the correct tense.
1. If you (see) ................ Sam, tell him about my new car.
2. When I got home I (discover) ………………… that somebody (break) ............... into my flat.
3. ”On Monday my father (give) me $20.” ”That's wonderful!”
”No, it isn't. I (already/spend) .............. it.”