'Pray' in the Bible

Judge for yourselves. Is it appropriate that a woman pray to God unveiled?

Therefore let him who speaks in another language pray that he may interpret.

For if I pray in another language, my spirit prays, but my understanding is unfruitful.

What is it then? I will pray with the spirit, and I will pray with the understanding also. I will sing with the spirit, and I will sing with the understanding also.