Thanks ________ your help, Mary.
— Did the young man climb to the top of the mountain in the end?— Yes. But without his friends’ help, he couldn’t do that by ______.
Xi’an is ancient city with long history.
— Sarah, you are going to Ireland to celebrate St. Patrick’s Day, ______ you?— Yes, I’m going to celebrate it with my cousins.
—We really shouldn’t use plastic bags any more when shopping.—_____ It’s important to protect our environment.
_____he is very tired , _____he still goes on working.