—Shall I help you carry your travel case to the train ,Granny? —Oh,no,my boy.It is heavy.Thank you anyway.
19.Vitamin D helps our bodies make a special chemical, and this special chemical,________,affects our brains, making us feel happy.
18.Everyone must have known the death of the waitress, __________?
17.---Tony is such a selfish person. ---I agree. Never again________with him.
16.After driving for 20 miles, Jackson realized that he______in the wrong direction.
15.We know it is hard to make such a decision____he has just built up the team for a year and the project is going through the important stage now.