The reason _____ he refused to attend the meeting was that they didn’t give him an invitation earlier.

______ you have finished your work, you ought to have a good rest. 

There was never any time for her to feel happy, _____ lots of people loved her.

Tom looked upon the test as an obstacle _____ his classmates regarded it as a challenge.

 A mysterious illness, referred to as “ a typical phenomena”, has been brought under control, the government said on Wednesday, ______ no cause of it has been made public.