7. I vegetables. They are good for my health. a) always eat b) am always eating c) have always eaten d) have always been eating 8. David basketball every Sunday. a) plays b) is playing c) has played
9. As far as I know they for St. Petersburg tomorrow. a) leave b) are leaving c) have left
10. They are so tired. They __for an hour. a) run b) are running c) have run d) has been playing d) have been leaving d) have been running​

7.b 8.a 9.c 10.b

correct

  1. a final group of utilities worth mentioning is designed (present simple passive) for backing up and cleaning up hard disks.2. a data base is (present simple) simply a collection of date that is stored(present simple passive) on one or more computers. 3. the operating system must first be loaded(present simple passive with modal verb) into primary storage.4. multitasking capabilities were once found only on minicomputers and mainframes. (past simple passive)5. utility programs monitor how often and how quickly an application program is being executed compared to all the other programs in the system at the same time. (present simple; present continuous passive)