Choose the correct answer.
2. They _____ for hours when they stopped to have lunch.
A) were working B) had been working C) worked
3.I _____ for two hours by 12 o'clock.
A) will have been reading B) will have read C) am reading
4. He ____ the letter as soon as it arrived.
A) had opened B) opened C) had been opening
5. Sarah ____ dinner when she burnt her finger.
A) was cooking B) cooks C) is cooking
6. Philip______ his dinner by the time we get home.
A) had been having B) wil have had C) will have
7. The people _____ for an hour before the rescuers came.
A) had been waiting B) waited C) are waiting
8 Emily ___ her lunch already, even thought it's only 10 o'clock.
A) has eaten B) was eating C) ate
9.Tom ____ his homework ever since he got home from school.
A) has been doing B) is doing C) does
10. My parents ____ to bed by the time i got home.
A) are going B) had been going C) had gone