Low-carbon lifestyle is of great benefit to improve the world environment.________can be enjoyed from it until you have a deep understanding of it, however.
Her daughter was admitted into college______ we had hoped.
_____his father had come, his face lit up.
______, they would certainly come and help us.
-How long ______ each other before they ______ married? --For about a year.
Smith ______ a book about China last year, but I don't know whether he has finished it.