The factory used 65 percent of the raw materials, the rest of which ________ saved for other purposes.

Tony is planning ________ his friend inTianjin.

Why did he___ that the man we met on the bridge was his father? —God knows!

Parents need to encourage kids to develop their potential _____ putting too much pressure on them.

Did you hear________ John?— Yes, he rang me this morning and we agreed________ a date to meet[ ]