(19) He couldn't help us, or rather he didn't want (
(3) so
2 it
(4) to
1 do
) in the early stages of a headache, aspirin can be effective.
2 Taking
3 Take
4 Taken
(20) (
1 To take
(21) Susan, (
) at the news of her friend's death, couldn't utter a word.
shock
3 shocked 4 shocking
having shocked
(22) Elena, (
get it.
) where she should look for the information, asked her colleagues where she could
as she knew
2 not knowing
3 not known
with knowing