Vamos should be correct, because when you have anything with 'nosotros' it will end in 'imos', 'emos' or 'amos.'
Answer:
1. Ella es mi amiga.
2. Ellos son mis compañeros.
3. Nosotros somos hermanos.
4. ¿Eres tú de Puerto Rico?
5. ¿De dónde son ellos?
6. Mi primo y yo somos amigos.
7. Ustedes son maestros.
- La galleta ⇝ "la"
- Los camarones ⇝ "los"
- El pescado ⇝ "lo"
- Tú ⇝ "te"
- Elena y Mónica ⇝ "las"
- Los dueños ⇝ "los"
- Ana ⇝ "la"
- Diego y yo ⇝ "nos"
- Yo ⇝ "me"

To replace the accompanying noun, write a <u>direct object</u>. They can be replaced if it is masculine it is "lo" (singular) or "los" (plural) and if it is feminine it is "la" (singular) or "las" (plural).
The <u>indirect object</u> replaces the one who receives the verb. It can be replaced, if it is in the third person, "le" (singular) or "les" (plural); they can also be replaced by unstressed pronouns (me, se, te, nos, os).
When a direct object and an indirect object are joined, <u>the indirect object must be put first and then the direct object</u>. When a third person indirect object is added, put "se".
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