39. _______ is certain, people’s living conditions in China have improved a lot since the 1980s.
Ms Li requested that we _____ spend half an hour reading English aloud every morning.
Many students’ failure ____ their carelessness in every examination.
After leaving college, Mike was employed in an international company and _____ there ever since.
The weather in London is so changeable that people always take their umbrellas with them _____ rain.
There is no _____ that taking regular physical exercise is good for your heart.