一

二

2.用方框内所给单词或短语的适当形式填空

signal　in a way　with the help of　arise　appearance

(1)Unexpected difficulties 　　　　　　  in the course of their experiment.  (2)The diner 　　　　　　　to the waiters to bring the menu.  (3)At the 　　　　　　　　of the enemy,we attacked.  (4)　　　　　　　　　　　　 his English teacher,Tom has made great progress in his English.  (5)　　　　　　　 he knew how to get along with his classmates. 

arose

signaled

appearance

With the help of

In a way