— She looks very happy. She __________ have passed the exam.— I guess so. It’s not difficult after all.
—Honey, the cat’s stuck in the tree. Can you turn off the TV and get a ladder…? —Oh, it jumped off. _____.
The development of industry has been _____ gradual process throughout _____ human existence, from stone tools to modern technology.
Ellen is _____ in both English and French, which gives her an advantage over other candidates.
We should consider what use can _____ such a material.
_____ on facts, the report should be reliable(可靠的).