A ________ of cows are eating grass on the farm．

flock

herd

swarm

school

They don’t listen, so don’t waste your time ________ them．

to tell

telling

tell

on telling

Pandas ________ bamboo．

feed on

feed with

are fed

fed

He felt that his life was no longer worth ________．

to live

to be lived

living

to be living

Police ________ road blocks on routes leading out of the city．

set off

set in

set out

set up

The letter ________ chiefly ________ export commodities．

is; referred to

take; notice of

has; effect on

is; concerned with

A new government ________ after the war．

was found

was set up

put up

founded

The customs officials ________ the contraband(走私物品)．

confused

quelled

confiscated

critisied

The police ________ the house and uncovered an arms cache．

raided

rained

ruined

roasted

Loose trousers ________ among the youths．

come into power

come into fashion

come across

come into