Another driver had just driven into the back of Jack's car ______ he was waiting at some traffic lights.
—Is the letter from your mother? —Yes.But she ________the letter herself,because she doesn’t even know one word.
________he referred to in his article was often discussed by many people in the past.
Social practice is an opportunity for students to gain________better understanding of how________society operates.
—I can’t thank you enough for the gift you sent me for my birthday the other day. —________.
The basic design of the car is very similar to________of the earlier model.