21st Century School Edition is ____ a newspaper. It helps us to improve our English a lot.

(2013·安徽省芜湖三校一模)If you don't take time to review each interview you go on, you're bound to ________ the same mistakes.

I sent a big bunch of flowers to the nurse as an ________ of thanks for her taking good care of my grandpa in the nursing home.

Studies show that people are more __________ to suffer from back problems if they always sit before computer screens for long hours.

—Can we go camping tomorrow，as planned?—I'm afraid not.The dark clouds ________a heavy rain.