Was it because of the heavy snowstorm in Europe _______ the flight had to be put off ?
#85290
A
which
B
so
C
why
D
that
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It was ______ back home after the experiment. 
#85256
A
not until midnight did he go
B
until midnight that he didn’t go
C
not until midnight that he went
D
until midnight when he didn’t go
_______was last night ______I read about the history of English.
#85250
A
This ,when
B
It ,since
C
It .that
D
It ,before
The question that puzzled them is ____ they can get rid of the air pollution in the area.
#84907
A
how is it that
B
that how
C
what is it
D
how it is that