For 1-6, all you have to do is conjugate the words by taking away the -ar at the end of the infinitive and adding the designated ending.
1. cantar, canto, cantas, canta, cantamos, cantan
2. preguntar, pregunto, preguntas, pregunta, preguntamos, preguntan
3. contestar, contesto, contestas, contesta, contestamos, contestan
4. practicar, practico, practicas, practica, practicamos, practican
5. desear, deseo, deseas, desea, deseamos, desean
6. llevar, llevo, llevas, lleva, llevamos, llevan
section two conjugate the infinitive like before, with the subject from the sentence
1. viajan
2. hablamos
3. llegan
4.dibujo
5. compra
6. regresan
7. termina (i think)
8. buscas
1.voy 2.como 3. bebo 4.doy 5.leo 6.uso 7.deshago 8.uso 9.pongo 10.duermo
these are the answers let me know if i got any wrong but im pretty sure they are right
B. Fueron
Fui is speaking in terms to yourself
Fueron is the best choice because you are talking about what your grandparents did or were they went, in this case you can almost assume the grandparents were doctors there for B. Is the appropriate response.