The football match was really fantastic, _________ when Smith scored in the last minute.

If the tunnel was built, it would Britain France for the first time in history.[ ]

Exactly when the first people arrived in ________ we now know as California, no one really knows.

Our teacher is always busy preparing lessons until 11 o’clock at night,______we students have gone to sleep.

I couldn’t follow what he said _______, but at last I understand.