The instructor asked us to list anything in our past that we felt ______ of，regretted and read our lists aloud.

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

—Do you think our teacher is ________ ？—Yes， he always corrects our homework and prepares his lessons　_______.

We’ve turned out large quantities of cars. This year      we’ve produced thirty thousand ones.

(2013·银川一中二模)—Are you pleased with what he has done?—Not a bit. It couldn't be________.