when he was walking in the street,he met one of his old friends
__When___ __walking___in the street,he met one of his old friends
they hurried up because it was getting dark
_It____ __was___because it was getting dark___that__they hurried up
we started early so that we could arrive there before 8 o'clock
we started early __so ___ ___as__ ____to_ arrive there before 8 o'clock
i find that it is difficult to learn English well,so i must sudy harder
i find __it___ difficult __to___ __learn___English well,so i must study harder
she no longer lives here
she __doesn't___ ___live__here___any__ ____longer_
he walked slowly to the bus stop,and he felt cold and hungry
he walked slowly to the bus stop,__cold___ ___and__ __hungry___