One of our rules is that every student wear school uniform while at school.

Like any other _____ here, he can walk ______ his two hands.

It was in the lab ______ was taken charge of by Professor Harris _______ they did the experiment.

Japanese people may bow and even give out their business cards to greet others, but they dislike ______ when you just put the cards in your pocket without looking .

David didn’t give up _________ he had failed in the experiment four times.