下列词语中画线的字，每对读音都不相同的一项是（ ）

There was a heavy rainstorm yesterday. The flood ________ the bridge over the small river.

haven’t got the service advertised on theirwebsite, then you have _____ to complain about it.

The art centre is _____ used to be a factory, _____ millions of tractors were made

Experiments of this kind ___in both the U．S and Europe well before the Second World War