Fill in the gaps with the verbs in the past perfect or the past simple. model: after loren had turned on the alarm, she locked the door. (turn on) by the time simone arrived, the police had already left. (arrive) 1. after the company )joe, he began to work on his first project. 2. ) the news before you saw it on tv? 3. michael didn’t want to see the movie because he read) the book yet. 4. the concert already ) when we (enter) the stadium. 5. until anne (meet) mark, she never ) in love. 6. bill (smoke) for years before he finally ). 7. sara ever )to london by herself before then? 8. how many fish the boys (catch) by the time it started raining? 9. you ) them to go to the beach, hadn’t you? 10. the girls ) in weeks, that’s why they (hurt)so much afterwards.

1. Software determines the order in which these operations are performed.
2. Applications software satisfies your specific need. 
3. These class of programs is the most numerous and perspective from the marketing point of view.
4. System programs are designed for the specific pieces of hardware.
5. By installing the driver you «teach» your mainboard to «understand» the newly attached part.
6. When a computer is first turned on, one of the systems programs is booted or loaded into the computers memory.
7. During the past five years the developing electronic network communication has stimulated more and more companies to produce various communication software.

1-Thank you. I (have read) your book. You can have it back.
2-Nelly, how long have you (been reading) "Robin Hood" ?
3-My elder sister (has been cooking) the pie since 10 and it is not ready yet.
4-I (have) already made the pie. Have you set the table, dear ?
5-Why are your hands dirty ? -I (have been working) in the gar den. I (have made) two flowerbeds.
6-I have never (been) to Italy, but I have always (wanted) to be there.
7-Oh, look ! She (has drunk) the whole bottle of milk.
8-Jack and Jonn (have been playing) tennis for an hour and a half and they (have played) three games.
9-I am tired. I (have been washing) the dishes for the whole evening. I am sorry, I (have broken) one plate.
10-Nick is working on his computer. He (has been working) since 9. But I (have not worked) on it in my life.