The way ________ was thought of by him ________ the experiment was similar to the way ________ you carried it out．

that, doing, which

which, of doing, in which

what, to do,/

it, of doing, that

St．Louis has replaced Camden, New Jersey ________ the most dangerous US city, according to a study based on FBI crime data which was released Monday．

for

to

as

with

When you go by train, please see to it ________ you take an express, ________ that stops only at big stations．

that, one

/, the one

that, it

/, it

The beautiful lady was at ________ loss when ________ word came that she was forbidden to drive for speeding．

a; the

the; a

the; the

a;/

is

that is

are

who are

Air is _________ and of no smell but we can feel its motion when there is a wind．

unavoidable

invisible

inaccessible

unavailable

If parents do not teach their child how to _________ himself, he will do anything at will．

behave

believe

help

enjoy

The teacher gave the students such a difficult maths problem _________ nobody worked it out．

as

which

that

so

The trapped explorers weren’t _________ much hope of survival before the rescue team arrived．

holding back

holding on

holding out

holding up

You needn’t worry about _________ like these if you have good social skills．

positions

conditions

situations

stages