I still remember _________ chess in class by my teacher about twenty years ago．

to be caught to play

being caught playing

catching play

having caught playing

The shopkeeper did not want to sell for _________ he thought was not enough．

where

how

what

which

You can’t imagine what great trouble they have _________ the problem _________．

to solve; being talked about

solving; discussing

to solve; to talk about

solving; being discussed

The old couple have been married for 40 years and never once _________ with each other．

they had quarreled

they have quarreled

have they quarreled

had they quarreled

They covered the body of the little hero with a flag, leaving his face _________．

to expose

exposing

exposed

expose

The place _________ the bridge is supposed to be built should be _________ the cross-river traffic is the heaviest．

which; where

at which; which

at which; where

which; in which

_________ of the heavy burden of homework, the children rushed out of the classroom and enjoyed themselves．

To be free

Freeing

To free

Freed

_________ good and sweet, this kind of apple was soon sold out in the market．

Tasted

Tasting

Having been tasted

Being tasted

_________ in the cage for half a day, the bird became hungry．

Being kept

Having kept

Having been kept

Have been kept

Outside the school _________ crowds of students, _________ to know the results of the exam．

stand; too anxious

stand; too excited

stands; very worried

stands; eager enough