It is these poisonous products ________ can cause the symptoms of the flu, such as headache and aching muscles．

who

that

how

what

The research is so designed that once ________, nothing can be done to change it．

begins

having begin

beginning

begun

All the young trees ________．

require taking good care of

require to take good care of

require being taken good care of

require to look after

We are advertising for a person who ________ teach English．

qualified to

is qualified to

is qualified and

is qualified for

The book ________ on the floor for ten minutes, but no one has picked it up．

is lying

has lain

has been lying

lay

When ________ about the discovery of penicillin, Sir Alexander Fleming said;“One sometimes finds what one is not looking for．”

asked

being asked

to be asked

asking

I don’t think I’ll need any money but I’ll bring some ________．

at last

in case

once again

in time

We can gain ________ good knowledge of nature in the country, but some people can’t get used to ________ silence．

a;the

the;/

/;a

/;the

How many countries did you go to during your ________ last year?

travel

journey

trip

travels

Normally, we learn to read English beginning ________ ABC．

from

as

with

by