I only intended to be there for a few days, but I         ended up staying for a whole month.

The schoolmaster hesitated ___ an instnat before he made the decision.

As is known to all language learners, the newly learnt words will soon be forgotten unless ______ used in everyday communication.

The earthquake damaged many houses and bridges; ______, it caused over 2,300 deaths. 

. ---You don’t seem to be quite yourself today. What’s wrong? --- Oh, I'm suffering from a cold. Nothing serious, ____.