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 friend in the street the other day whose changes surprised me a lot.

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

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.

    A. came up       B. came over     C. came across     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