Carolina / desear / cambiar / contraseña question 2 with 1 blanklos científicos / deber / explorar / planeta question 3 with 1 blankel matemático / tener / responder / interrogantes question 4 with 1 blankel ingeniero / tratar / mejorar / calidad / computadoras question 5 with 1 blanklos investigadores / deber / contribuir/ la ciencia question 6 with 1 blankla operadora / tardar / enviar / mensaje

The correct order of the sentences and conjugation of the verbs are:

1. Carolina desea cambiar la contraseña.

2. Los científicos deben explorar el planeta.

3. El matemático tiene que responder interrogantes.

4. El ingeniero trata de mejorar la calidad de las computadoras.

5. Los investigadores deben contribuir a la ciencia.

6. La operadora tarda en enviar el mensaje.

Explanation:

Every one of the sentences has a conjugated verb in Present Simple based in the personal pronoun that accompanies it, in this was selected the correct form taking into account it, to give sense to the sentences, was added articles and connectors that allow give gender or number to the substantives.