Looking at my mother's ___________ face, I regretted not having told her my whereabouts on the phone.

What he said sounds ____.

Jack is late again. It is ___ of him to keep others waiting.

Do remember to be ________. We must avoid any possible risks when doing this dangerous chemical experiment—burns, poisonous gases or cuts from broken tubes.

After a day’s walk in the desert, the explorers reached the camp, _______.