Put the verbs in brackets into the correct present tense. example: who has seen (see) my umbrella? 1. – what / do)? – i ) a letter. 2. samantha ) tennis with her friends every weekend. 3. tim and matilda ) married since 1991. 4. uncle bill / decorate) the bathroom. 5. pauline and tom ) in the school choir twice a week. 6. / speak) to? 7. sarah is very happy. she ) a poetry competition. 8. he ) two cups of coffee this morning. 9. my ) in america at the moment. 10. they / change) jobs every five years. 11. i / cut) my hair myself. 12. linda ) in the library for three hours. 13. we ) in a concert next weekend. 14. who ) my diary? 15. tim ) the house at 7 o’clock every morning.

1. Who has been using (use) my toothbrush? 
2. “What (are you/doing)?” “I (am writing) a letter”. 
3. Samantha (plays) tennis with friends every weekend. 
4. Tim and Matilda (have been) married since 1991. 
5. Uncle Bill (has just/decorated) the bathroom. 
6. Pauline and Tom (sing) in the school choir twice a week. 
7. Who did you speak (are/were you speaking) to? 
8. Sarah is very happy. She (has won) a poetry competition. 
9. He has drunk (He drank) two cups of coffee this morning. 
10. My friend (is living) in America at the moment. 
11. They (usually/change) jobs every five years. 
12. I (normally/cut) my hair myself. 
13. Linda (has been studying) in the library for three hours. 
14. We (are playing) in a concert next weekend. 
15. Who (has been reading) my diary? 

Tom, Thanks for offering to chair tomorrow’s meeting for me. Apart from Sally and Dave, the sales staff …needn't.. attend, but the Personnel people …mustn't.. miss it, as several matters concern them. You …needn't.. mention the new offices – we can deal with that later and you …needn't.. discuss the changes in the computer course timetables since they’re not urgent. Don’t forget that you …mustn't.. mention the visit by inspectors – we don’t want people panicking. You …mustn't.. forget to bring up the matter of the Smithson contract, and you also …mustn't.. leave out the new manager’s appointment. You …needn't.. go into details unless people have questions. But remember you …mustn't.. give anyone the idea that their job is at risk because of this. Make it clear that employess …needn't.. speak unless they want to. Last but not least, you …mustn't.. mention the staff-party Mr. Jones wants to announce that himself. By the way, you …needn't.. take notes, as my secretary will be there to do that. Thanks, Laura. 

1. The first digital computer could__solve__a lot of mathe­matical problems at a fast ___sped___. 2. Vannevar Bush built the first __electronic___computer in 1930. 3. Babbage's analytical engine was designed to ___process___ data. 4. J.von Neumann invented a machine that was able to__process___ not only data but also __texts___. 5. Neumann__came up with___ the idea of storing data in a __memory___ . 6. Computers use two conditions for__numeric___symbols. 7. The invention of___interface___ _devices__made computers possible to control and __generate___electronic signals. 8. Due to__cash___ __memorycomputers could perform__operations much faster.