-What made Susan so angry?-____ in the rain for a long time.Being kept waiting B. Being kept to waitC. Because of waiting D. She was kept waiting
—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).