When I was doing shopping in the market the other day, I _____ an old friend of mine, who I hadn’t met for twenty years.

I ______ an old letter while I was searching my drawer.

A．came up          B．came across        C．came on          D．came about

I _____ an old friend of mine while I was in London.

A . came across      B . came up      C . came out      D . came about

I ______ an old letter while I was searching my drawer.

Yesterday I _______ an old friend of mine at the shopping mall.

A．came up          B．came out          C．came across       D．came down