His sister left home in 1998, andsince.
had not been heard of
has not been heard of
had not heard of
has not heard of
41.“It” is often used to________a baby. 42.
43.It was not until 1936________basketball became a regular part of the Olympic Games. 44.
35.__________________you met the Englishman?
36..___________that she has gone to the United States? 37.
37.________________certain that his invention will lead to the development of production.