1 Louise usually (phone)me on Friday, but she (not/ phone) last Friday. 2 The phone (ring) while we (have dinner) 3 Jane is an experienced teacher. She (teach) for 15 years 41... (buy) a new jacket last week, but I (not/ wear) it yet. 5 I went to Sarah's room and (knock) on the door, but there (be) no answer. Either she (go out) or she (not/ want) to see anyone. 6 Come to see me on Friday. I (finish) my new book by then.
Hi, I am Ray. My Dad is not a famous person or a national hero. But he is my hero! He is always fun. I can play-fight him and he doesn't mind. He isn't a person who won a championship or walked on the Moon or saved people in trouble but he is kind and clever and he is never bored to be with. My best days are the days that I spend with my father. He knows a lot about space exploration and the achievements of scientists. I like his stories about space expeditions and astronauts.Sometimes my friends join us to listen to his stories and I am proud of my Dad.
The user is aware of the effects of different applications programs but operating systems are invisible to most users. They lie between applications programs,such as word processing, and the
hardware. The supervisor program is the most important. It remains in memory,therefore it is referred to as resident. Others are called non-resident because they are loaded into memory only when needed. Operating systems manage the computer's resources, such as the central processing unit. , they establish a user interface, and execute and provide services for applications software.Although input and output operations are invoked by applications programs, they are carried out by the operating system.
The user is aware of the effects of different applications programs but operating systems are invisible to most users. They lie between applications programs,such as word processing, and the
hardware. The supervisor program is the most important. It remains in memory,therefore it is referred to as resident. Others are called non-resident because they are loaded into memory only when needed. Operating systems manage the computer's resources, such as the central processing unit. , they establish a user interface, and execute and provide services for applications software.Although input and output operations are invoked by applications programs, they are carried out by the operating system.
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