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

－Is your headache getting_____________?       －No, it’s worse.

 Scientific research shows that animals can show         emotions like human beings. They are sometimes lively, and sometimes bad-tempered.

----Must I finish the report tonight? ----It’s not ______. You can do it next week.

Mrs O’Neill asked ＿＿questions and she didn’t scold us either.