1. I hard, so I felt very tired.
a) had worked - if you want to emphasise that the job had been finished before you felt tired
c) had been working - if you want to say that performing some work made you tired
2. I my money into real estate.
b) have invested - if you mean that it's going give you profits
a) invested - if it happened some time ago and there's no connections to present situations
3. We alreadythe goods when your telegram arrived.
b) had shipped
4. The invoice by the end of the week so we sent them a strong reminder.
c) hadn't arrived
5. I nothing on the Internet this month.
a) have bought
6. This strategy seems to be good. Sales of our products for some time.
b) have been increasing
1. If I were you, I would write to her
2. If I were taller, I would play in a basketball team
3. If you stayed longer, you would meet my parents.
4. If she didn't eat so much, she would be slimmer
5. If he didn't see them, he would not know the truth
6. What would you do if you saw him?
7. What would you do if you had million dollars?
8. If they had million dollars, they would travel around the world
9. What would you do if you lost your key?
10. If I lost my key, I would call my parents
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