A.help | B.to help | C.helping | D.helped |
A.buy | B.to buy | C.buying | D.bought |
A.improve | B.to improve | C.improving | D.improvement |
A.to save | B.save | C.saving | D.saved |
A.grant | B.granting | C.granted | D.grantness |
A.have good knowledge of | B.to have good knowledge of |
C.to have a good knowledge of | D.has a good knowledge of |
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