选择合适的单词，填在横线上

at

for

on

to

up

（1）I go to the playground

at

at

three o'clock．
（2）When do you get

up

up

？
（3）We go

to

to

school at seven fifty every Monday．
（4）This flower is

for

for

you．
（5）What can you see

on

on

the river？