Living in the central African desert has its problems, ________ drinking water is not the least．

for which

of which

to which

in which

The Beatles, ________ many of you are old enough to remember, came from Liverpool．

what

that

how

as

Women ________ drink more than two cups of coffee a day have a greater chance of having heart disease than those ________ don’t．

who;/

/; who

who; who

/;/

I was given three books on cooking, the first ________ I really enjoyed．

of that

of which

that

which

Look out! Don’t get too close to the house ________ roof is under repair．

whose

which

of which

that

There were dirty marks on her trousers ________ she had wiped her hands．

where

which

when

that

The English play ________ my students acted at the New Year’s party was a great success．

for which

at which

in which

on which

I don’t like the way ________ you laugh at her．

that

on which

which

as

This is the last time ________ I shall give you a lesson．

when

that

which

in which

You can never imagine what great trouble I have had ________ the patient who received a serious wound．

treat

to treat

treating

treated