In this sentence we need to fill in the blank with the preterite form of the verb in parentheses. The simple present tense is used to talk about habitual actions or routines. This tense is also used to describe things that happen now or in the near future. So:
1. Right answer:
traigo
Traigo is the conjugation of the verb traer that matches the first person singular in the simple present. This person is yo and translates as I in English. So I didn't bring my books. As you can see, the verb traer means to bring and means to make someone or something to come to a place. Finally:
Yo no traigo mis libros
2. Right answer:
gancho
Gancho is a masculine singular noun. Recall that a noun is a word or group of words that is the name of a person, a place, a thing, or activity or a quality or idea. So gancho means hook and is a curved piece of metal or plastic, used for hanging things on. Therefore:
Yo cuelgo el gancho
3. Right answer:
digo
Digo is the conjugation of the verb decir that matches the first person singular in the simple present. So it is important to tell the truth. So truth means verdad and is the quality or state of being true. So we can write this sentence as follows:
Yo digo la verdad
4. Right answer:
digo
This sentence also stands for the first person singular. So we also use here the verb decir conjugated as digo. This sentence is a negation because it uses the word no. Negation is an expression that means no and is used to contradict some or all of the meaning of a positive sentence. Therefore, I tell him nothing:
Yo no le digo nada