I forgot to include the following sentences. Thank you.

1) I can't come. I have to study for the school (?), I have to study physics for tomorrow's test, look after my brother, clean my room, go the dentist's.
2)I have already an appointment with Peter (Where shall I place already?)
I'd rather go the the cafè, watch a DVD on TV, play computer games, play cards, go on another day.
3) Why don't we go for a motorbike/a bike ride, sightseeing, go for a walk in the city centre?
4) In Italy you get a (not the) newspaper at the newsgent's and cigarettes (without article?) at the tobacconist's.

1) I can't come. I have to study for school. I have to study physics for tomorrow's test. I have to look after my brother. I have to clean my room. I have to go the dentist.

2)I already have an appointment with Peter. I'd rather go the the cafè, watch a DVD on TV, play computer games, play cards, go on another day.

3) Why don't we go for a motorbike/a bike ride, sightseeing, go for a walk in the city centre?

4) In Italy, you get a newspaper at the newsgent's and cigarettes at the tobacconist's.

1) To answer the first question, the phrase "I have to study for the school" seems incomplete. However, based on the context, it appears that the missing word could be "exam" or "test." To confirm this, you can ask the person who wrote the text.

As for the rest of the sentence, it seems like a list of activities the person needs to do. There are various possibilities for how to complete it. Here is one possible completion:

"I can't come because I have to study for the school exam, study physics for tomorrow's test, look after my brother, clean my room, and go to the dentist's."

2) In the second question, the word "already" seems to be out of place. It would make more sense to place it before the verb "have." Here is a revised version of the sentence:

"I already have an appointment with Peter. Where shall I place already?"

3) The third question seems to be suggesting alternatives to a plan or activity. To complete the sentence, you can insert the suggested activities after each phrase. Here are a few possibilities:

"Why don't we go for a motorbike ride, a bike ride, or go sightseeing? Alternatively, we could go for a walk in the city centre."

4) In the fourth question, the use of the indefinite article "a" before "newspaper" and the omission of an article before "cigarettes" is correct. It is common to say "get a newspaper" or "get cigarettes" without using the definite article "the." This is because the speaker is referring to any newspaper or any cigarettes in general, not a specific one.