What _______ to her yesterday evening

ience of computer, _______rapid progress hasbeen made in recent years, is the most important of all science.

It’s difficult for me to decide which one to choose, because ____ of them are good.

Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.

He is very angry with his mother, because his mother always__________him with the best student.