One more month, _______ the grapes in the yard will be ripe

These two kinds of cell phones differ ________ shape, but they are similar ________ each other in some functions.

_____ do they have in the desk — Some books.

It is wise of you towell trained workers for untrained ones in your workshop. A．substitute B．changeC．exchange D．employ

What were you doing this time yesterday—I______ my homework.