ened carefully to his long boring speech, butcould not ________ what he was talking about

Radium salts，which have been found to______ in bones，give rise to bone cancer.

下列各句中，没有语病的一句是（ ）

Would you like some coffee or tea—________. I prefer a glass of water.

You did not perform as well as the other competitors-____,you failed.[ ]