1.
Yo conozco a muchas personas en México.
(I know a lot of people in Mexico.)
'conozco' is the correct conjugation of conocer (to know) for 'Yo' in this sentence. conocer is used for expressing that you know a person, place, or object.
2.
Doy un regalo a mi hermano.
(I give a gift to my brother.)
'doy' (I give) is the only word that would make sense in this context: you give a 'regalo' (gift) to people you love.
3.
Yo no veo bien la pizarra de clase.
(I can't see the class board well.)
'veo' (I see) is the only verb that makes sense in this context.
4.
Ella sabe bien el vocabulario.
(She knows the vocabulary well.)
'sabe' is the correct conjugation of saber (to know) for 'Ella'. saber is used to refer to your knowledge of something.
5.
Yo no sé la repuesta.
(I don't know the answer.)
'sé' is the correct conjugation for 'yo' in this sentence. saber is used to refer to the answer, which you lack the knowledge of.
Answer: papeles y lápices , libros
