Unit 4Vocabulary
1. assist (v) 帮助，援助   assist sb. in/with…在…方面帮助某人   assist sb. to do …帮助某人做某事   assistance (n) 帮助   assistant (n) 助手
   During our previous journey, Sarah was considered a wonderful _________ because she offered us a lot of __________.
assistant
assistance
             assist sb. in/with…
              assist sb. to do…
1. Mary assisted her mom _____ housework.
2. Mary assisted her mom ___ do housework.
3. Mary assisted her mom ___cleaning room.
4. Mom assisted Mary __ ...