“I took part in the TOEFL. It was really hard.” “Did you ______ a lot?”
The science of medicine _______ progress has been rapid lately is perhaps the most important of all the science.
Is this the reason _______ at the meeting for his carelessness in his work?
This is Mr. White, _______ I think has something interesting to tell you.
_______ has been announced, we shall have our final exams next month.
I walked in our garden, _______ Tom and Jim were tying a big sign onto one of the trees.