The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
Look ___ the note ___ the text ___ page 58.
Mary is a nice girl ____ she is careless sometimes.
Before liberation, his father died ___ hunger while his mother ___ overwork.
Who was it that let ____ the cry of surprise.
Teenagers are often compared ___ the rising sun.