People have always been_______ aboutexactly how life on earth began.

The driver began to speed up to ______ for the hourhe’d lost in the traffic jams

cal government in Shenzhen has recently passed anew regulation forbidding supermarkets and stores to _______ free plastic bagsto shoppers, in order to protect the environment.

The present situation is very complex, so I think it will take me some time to ____________ its reality.

All the students in my class enjoy ______ English classes.