I have an art lesson _________ Monday. (  )

A．at

B．in

C．on

Today is Friday. The next day（第二天）is __________. (  )

A．Saturday

B．Thursday

C．Sunday

选择恰当单词补全空缺。
【小题1】How many days are there __________（in/on）a week?
【小题2】What's the first day __________（of/to）a week?
【小题3】__________（Do/Are）you like sports?
【小题4】I usually go to the park __________（in/on）Sundays.
【小题5】__________（What/What's）day is today?