dy of natural history is not something to be left to biologists In fact,their capacity _________ the time they can spend away from their offices isvery limited

I met a good friend of mine while I _____ on the street.

u have any idea what Paul does allday—As I know,he spends at least as much timeplaying as he______

I can ________ the house being untidy, but I hate it if it’s not clean.[ ]

It’s the protection for the trees ______ really matters, ______ how many trees are planted each year.[ ]