They are thankful for the gifts but they don't know what to do with them because the gifts are either invisible or there are no gifts at all.
You might just have to read the one page and write big so it looks like you know it
The correct options are I AND II.
When one buys a product that is not working as it ought to, one has the right to return such a product to the manufacturer. When returning such product, it should be accompaned by by a letter of complaint, which gives information about the product and the date and price of the product.
Answer:
it is a comma because you have to have a cordinative adjective to have a comma
Explanation: