Onewaytounderstandthousandsofnewwordsistogain__________goodknowledgeofbasicwordformation.
A、/I don ’ t want to buy the sweater because I don ’ t like the color. __________, it is too expensive.
At this moment the bell rang, ________ the end of class.
Hecameintotheclassroom_________.
His backache is only _________ for not watering the flowers.
The boy bought a new dictionary__________ he turned for help.
