We’ve just heard a warning on the radio _______ a typhoon may be on its way.
#68290
A
what
B
when
C
which
D
that
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While having our dinner, _______. 
#68160
A
the door bell rang
B
our newspapers came to the door
C
we heard the door bell ringing
D
the postman brought several letters to us
While I _______ TV in the sitting room, the bell _______.
#41301
A
watches, rings
B
watched, rang
C
was watching, rang
D
watched, was ringing
_________ is known to all,good friends _________ happiness and value to life.
#72470
A
It; add
B
As; add
C
It; add up
D
As; add to