So when did you meet Joan —It was last Sunday _______ she came to visit my sister.

Catherine Ⅱ had the Amber Room moved to a palace outside St. Petersburg __________ she spent her summers.

______ I spoke English before foreigners, I was a student of high school.

Some researchers are finding that daydreaming may beimportant to ______ mental health and it is ______ good means of relaxation.

_________________ his father ___________his mother likes music．