The young scientist has made such great achievements in his chosen field ______ nobody else can make.

The company has recently taken on fifty new workers some of_______ have just graduated from university.

Jim passed the final exam, ___________ surprised his classmates and parents.

A woman with a bleeding hand hurried in and asked, “Is there a hospital around _____ I can get some medicine for my wounded hand?”

— Tom seems not so enthusiastic as he was two years ago.
— Yes. He’s really reached a point in his career ______ he has to decide what to do next.

Teaching is a difficult job ______ requires great skill and patience．

The scientists have made an exhaustive study of the virus _______ many people have been inflected.

The Nuclear Security Summit is an initiative of Mr. Obama,       considers nuclear terrorism to be one of the greatest threats to international security.

Finally we decided to fly to France for the winter holiday on our first stop，    we planned to stay for three days．

Most of my friends shop at the stores _____ the goods are very cheap.