根据句意，用所给动词的适当形式填空。
小题1:When I saw the parade in Disneyland, I couldn’t stop ___________ (take) photos .
小题2:It takes about three hours ___________ ( fly )to Hong Kong .
小题3:Students should read more books ___________ ( improve ) their writing .
小题4:Sadly, the little dog ___________ (die) for some time .
小题5:You must ___________ (return) these books to the library as soon as possible.
