This desk is new , that one is old .

This desk is new ,         that one is old .

#57184

but

and

for

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I’m tidy ,  my sister is not.

#56145

and

but

under

always

I met a friend of mine       I was walking in the park.

#56579

before

when

because

until

The rivers will become dirtier and dirtier _______ we take action to protect them.

#55533

since

until

Unless

 –What was your brother doing at this time yesterday?-- He was reading a magazine ________ I was writing an e-mail at home.

#55135

as soon as

after

until

while

_________ she is a little girl, _________ she knows a lot.

#56192

Though, but

But, though

Though,/

But. /