I couldn’t help but _____very worried about his illness when I heard he was in hospital because of heart disease. 
#65513
A
to feel
B
feel
C
feeling
D
to have felt
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  As we all know, Jack is experienced _____ the problem of this kind.
#77229
A
to work out
B
at working
C
at working out
D
for working out
We should encourage the planting of new trees and ______our__________ woodland.
#72399
A
keep…present
B
protect …existed
C
save…present
D
preserve…existing