Vitamin D helps our bodies make a special chemical，and this special chemical, ______
affects our brains，making us feel happy．
A．in turn B．in particular C．in advance D．in short
Everyone must have known the death of the waitress, __________?
A．must they B．mustn't they C．haven't they D．have they
．一 Tony is such a selfish person．
一 I agree. Never again ________ with him.
A．1 will deal B．I do deal C．will I deal D．do I deal
After driving for 20 miles，Jackson realized that he ________in the wrong direction．
A．was driving B．drove C．had been driving D．had driven
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．
A．that B．as C．when D before
In a sports team each player has a clear role，and there are few _______when members are
uncertain of their roles．
A．occasions B．positions C chances D．situations
