1
.
When
(
he
/
to
work
)
there
?
2
.
They
(
to
study
)
all
night
.
3
.
He
(
not
to
exercise
)
enough
.
4
.
(
I
/
to
talk
)
too
much
?
5
.
It
(
to
snow
)
on
Christmas
Eve
.
6
.
They
(
not
to
talk
)
.
7
.
Why
(
you
/
to
study
)
on
a
Saturday
night
?
8
.
You
(
not
to
sleep
)
.
9
.
I
(
not
to
stay
)
in
a
hotel
.
10
.
They
(
to
take
)
the
exam
.