His appearance has changed so much that you _____ not recognize him.

Hello , Frank . __________ — He is my uncle Tom .

It was in the dining hall _______ was locatedbehind the teaching building _______ I met her for the first time

Whenyou are in trouble(麻烦), you can _________ help_________ the police.

__ I do not know what I ___________ without the suitcase you lent me. __ Glad to have been of some help to you.