Какое время поставить? our to school in the morning a) are going b) go

Our children go to school in the morning 

Время Present Simple. Используется, когда говорим о регулярных действиях.

1. Сhain surveying

2. Angles in surveying are measured with special instruments called transit

3.  Route survey is a survey necessary for the location and construction of transportation or communication lines such as highways railroads, canals, transmission lines and pipe-lines.

4. City surveying

5. Before construction begins the exact position of the various parts of the dam are fixed on the ground by using normal surveying methods. In choosing the site for a dam an engineer should study on a map the courses of all the rivers and streams in the area. By reading the contours he should calculate the amount of water which can be stored by building a dam of a given height in a certain place.

6. When deciding the route of a railway or road, the gradients, radii of curves, heights of embankments and depth of cutting can be calculated from data supplied by the surveyor

7. Terrestrial photogrammetry or photographic surveying from ground stations

1) stay at home:   I'm not staying at home tomorrow.
2) meet my friend:   I'm meeting my friend tomorrow.
3) leave for America:  I'm not leaving for America tomorrow.
4) write a letter to granny: I'm not writing a letter to granny tomorrow.

Dear Alex,
Thank you for your letter. I am always glad to hear from you, you know it.  Today I'll try to answer your questions about New York. You asked me about our programme there, well, we are arriving to NY in a week. There we are staying with American families and are having some classes before lunch time during our stay in NY and we are doing various sights after lunch. On Monday we are visiting Rockefeller Centre, on Tuesday we are walking in Central Park, on Wednesday we are having a sea trip to the Statue of Liberty, the next day, that is on Thursday we are doing the Guggenheim Museum, on Friday we are visiting a concert hall in Broadway (by the way, there are about 30 theatres and concert halls in this street). The last thing we are going to see there is the Impire State Building.The Programme is great, I hope to take a lot of pics there. That's all for now. 
Keep in touch.
Best wishes,
Dima