Are the following sentences correct?

When would you go when you are waiting for your plane to departure?
The table is under Exercise 1.
You received a file from you friend on a computer screen while talking to him I want to say: Please open the file I sent you, look at the top of the page it has the title Travelling and go down to the second page. On the second page at the top you can see a nice small table with some exercises below or under. Your task is to fill the missing gaps.
If you have to wait at the airport you can wait in the waiting room or you can go to one of many duty free shops.
What types of documents do you need when applying for a business visa?
There are the apllications items that you have to submit when applying for a visa.
When you are invited to the Embassy you should show all necessary documents like:
the confirmation of payment for your visa application or
the receipt of visa application fee
it is also obligatory to take a passport
Before crossing the border of another country you have to go to the customs.
At the top of the page or on the top of the page
At the bottom of the page or on the bottom of the page
I am waiting for your email to confirm the time of the next lesson.
What is the best time for you to have the next lesson?
When would you like to have the next lesson?
What have you been doing since we last talked to each other?
It has been ages since we last talked to each other
We haven't talked to each other for 4 months.
You may be asked several questions at the visa interview
They do not want to prolong the validity of my visa.