He began to try every material ________ the best way to work it out．

known to find

knowing to find

knowing finding

known finding

She’s upstairs ________ letters．

writes

is writing

write

writing

It was so cold that he kept the fire ________ all night．

to burn

burn

burning

burned

He had his leg ________ in the match yesterday?

to break

broken

break

breaking

What’s the language ________ in Germany?

speaking

spoken

be spoken

to speak

The poor boy looked to the right and to the left, ________ where to go．

not knowing

not to know

didn’t know

not being known

Five people won the “China’s Green Figure” award, a title ________ to ordinary people for their contributions to environmental protection．

being given

given

is given

was given

This is one of the books ________ by him now．

to be written

being written

having been written

is been written

After a knock at the door, the child heard his mother’s voice ________ him．

calling

called

being called

to call

The tunnels ________ dead leaves and branches．

choked up

are choked up

is choked with

are choked up with