Many college graduates are willing to start online shops to get over the period ________ they have difficulty finding a satisfactory job.
It was not until dark _____ he found _____ he thought was the correct way to solve the problem.
_________ this is the biggest mistake we have made.
It i s the second time that the poor area_______.
In modern times, the development of science is ________ .
He insisted that his plan _______ carried out at once.