It can take up three months to _____ a man to do this work.
The English teacher her students how to improve their comprehension skill since last week.
Mary ______ all the housework, she dropped herself into the sofa, sighing with relief.
—How many practical plans has your deskmate made this week?— . All have turned out disappointing.
Fortunately , the adventurers brought the GPS with themselves, they might have been lost in the desert.
— People should spare no efforts to protect the environment. — ________. Air pollution does harm to our health.