In the last ten years, they _______ three great scientific experiments.
-- Putting on a happy face not only helps us make friends but also makes us feel better.-- ________.
--Don’t you think Jim was brave to go bungee jumping?-- Personally, I thought he was ________ brave.
The test ________ a number of multiple choice questions.
The teacher as well as 6 girls and 8 boys from her class ________visiting a museum when the earthquake struck the city.
Studies show that people are more ________ to suffer from back problems if they always sit before computer screens for many hours.