Smell the milk to tell if it's sour．

For a family of related genes that do not match genes of known function in the sequence database, it should be possible to deduce their function by using “evolutionary tracing” to see where conserved amino acids cluster on their surfaces.

A joke is something ______ makes you laugh.

-- What do you think about early marriage ？

Mr Wickham was truly in love with Georgiana.

Don't pretend you haven't been smoking．I could smell cigarettes the minute I walked through the door．

This hand cream smells lovely/sweat，what's it called？

The nurse ______ the baby and put it in the cradle．

If only I could ______ those tactless words of mine!

Laura opened the envelope，______ the letter and begin to read it carefully．