70. I know it is difficult __________ him to talk like the lecturer, but I think he should grasp every chance .
People in Korean ___ bow when they meet for the first time.
____ Chinese are learning English for a better future.
The box was too heavy for me to carry, ___ I pulled it into my room.
Sam enjoys ___ stamps.
___ many children like sugar, I think they had better try not to eat it too often.