—Take this medicine three times a day,Tom!—Do I have to take it?It ________ so terrible.
I ____ see him yesterday.
Is there anything else ____ you want to get ready for the party this evening?
____ on Monday night that all this happened?
It was in the school ____ he had studied ____ he began the important experiment.
It is the teacher ____ taught me when I was a child ____ I am going to visit.