—Have you ever seen two leaves that are exactly the same?—Never. Leaves differ ____ each other ____ size and shape.
I travel to the Binhai New Area by light railway every day,________ do many businessmen who live in downtown Tianjin.
A person ________ email account is full won't be able to send or receive any emails.
She'll never forget her stay there ________ she found her son who had gone missing two years before.
Gun control is a subject ________ Americans have argued for a long time.
Whenever I met her,________ was fairly often,she greeted me with a sweet smile.