254. You can recognize a tree by the ______of its _______.

I received his mother’s phone call at tenOnly then did I know that he was badly________in an accident the day before yesterday

____ the foreign student had learned Chinese for several years in his own country, he could hardly understand the local Chinese in China.[ ]

Mary felt sad over the loss of photos she had shot inAustralia, ______ that was a memory she especially treasured.

The traffic was busy on our way to the train station, _____ we caught the train on time at last.