With new technology, pictures of underwater valleys can be taken _________ color．

by

for

with

in

The employment rate has continued to rise in big cities thanks to the efforts of the local governments to increase _________．

then

those

it

that

Sit down, Emma．You will only make yourself more tired, _________ on you feet．

to keep

keeping

having kept

to have kept

The shocking news made me realize _________ terrible problems we would face．

what

how

that

why

Maybe if I _________ science, and not literature then, I would be able to give you more help．

studied

would study

had studied

was studying

_________ volleyball is her main focus, she’s also great at basketball．

Since

Once

Unless

While

Mary was much kinder to Jack than she was to the others, _________, of course, made all the others upset．

who

which

what

that

It’s important for the figures _________ regularly．

to be updated

to have been updated

to update

to have updated

Tom _________ in the library every night over the last three months．

works

worked

have been working

had been working