up，of，in，without，at，about，after，by

（1）They often drop

by

by

their friends' homes at weekends.
（2）In Switzerland，we never visit a friend's house

without

without

calling first.
（3）We need to know

about

about

table manners when we visit Japan.
（4）First

of

of

all，you should finish your homework.
（5）He picked

up

up

his hat and went out.
（6）Tom arrives

in

in

Beijing on time.1.
（7）He was pointing his finger

at

at

me.
（8）Don't blame （责骂）him anymore.He is a child，

after

after

all.