1.I ..........hard, so I felt very tired.
a) had worked b) have worked c) had been working

2. I........ my money into real estate.
a) invested b) have invested c) invest

3. We already........the goods when your telegram arrived.
a) have shipped b) had shipped c) shipped

4. The invoice ........ by the end of the week so we sent them a strong reminder.
a) had arrived b) hasn't arrived c) hadn't arrived

5. Our distributor called while I........to Jim.
a) was talking b) have been talking c) would be talking

6. This strategy seems to be good. Sales of our products......... for
some time.
a) have increased b) have been increasing c) had been increasing

7. The price of petrol ......down by about 1%.
a) had gone b) has gone c) has been gone

8. Mark........at a company for seven years before he started his own business.
a) was working b) has been working c) had been working