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1. Where are the pupils? – They (to plant) trees. They (to plant) them since the morning. They
always (to plant) trees in October. They already (to plant) several hundred trees this year.
2. Ann (to have) her music lesson now. She (to have) her music lessons twice a week.
3. I am going to take a walk. I (to do) all my home exercises already. I (to do) them for three
hours.
4. Since when they (to build) this house?
5. At last I (to find) the book I need. I (to look) for it for a quarter of an hour.
6. Don’t shout. Helen (to read) an English book. She (to work) at her English every day. She (to
learn) this language for three years. She (to read) many English stories this year.
7. What you (to do) in the morning? What you (to do) since the morning?

1)-The Internet, then known as ARPANET, was brought online in 1969 under a contract let by the renamed Advanced Research Projects Agency (ARPA)

2)-ARPANET used packet switching to allow multiple computers to communicate on a single network..

3)-Raymond Samuel Tomlinson (April 23, 1941 – March 5, 2016) was a pioneering[1][2][3][4] American computer programmer who implemented the first email program on the ARPANET system, the precursor to the Internet, in 1971; he is internationally known and credited as the inventor of email.

4)-After leaving CERN in late 1980, he went to work at John Poole's Image Computer Systems, Ltd, in Bournemouth, Dorset. He ran the company's technical side for three years. The project he worked on was a "real-time remote procedure call" which gave him experience in computer networking.

Объяснение:

1. (+) Mr. Smith fixed his car yesterday morning.

2. (-) His wife didn't water plants in the garden.

3. (?) Did their children clean the yard and then they play basketball?

4. (+) In the evening their boys listened to loud music and watched TV.

5. (-) Their little girl didn't cry.

6. (?) Did her brothers shout at her?

7. (+) I went to the gym at seven o'clock yesterday.

8. (-) Yesterday John didn't clean his teeth at a half past seven in the morning.

9. (?) Did Jane do English exercises yesterday?

10. (+) His brother ate pizza yesterday.

Объяснение: