The two prisoners escaped ________ over the tall wall．

by climbing

from climbing

to climb

climbing

Tom and David are both my good friends．David seems very serious, ________ Tom has a good sense of humor．

when

where

which

while

Every year, millions of people visit the Palace Museum, and many of ________ are foreigners．

them

that

whom

what

At times this balance of nature is ________, resulting in a number of possibly unforeseen effects．

troubled

confused

interrupted

disturbed

The old woman spoke to the girl again, raising her voice a bit, but still ________ no answer．

received

receiving

having received

to receive

On each side of the street ________ a lot of trees．

stands

grow

is standing

are grown

He ________ on the bench, with his head down and his eyes ________ on the ground．

was seated; fixing

was seated; fixed

seated; fixing

seating; fixed

Scarcely had she fallen; than

No sooner did she fall; than

Hardly she had fallen; when

Hardly had she fallen; when

In recent years, millions of peasants flood into cities to ________．

earn their life

make their lives

earn their livings

make their living

The housemaster was strict．He required that we ________ television on weeknights．

not watch

could not watch

not be watching

should not have watch