问题描述：
下面的括号应填什么英语介词
1.( ) year
2.( ) yesterday
3.( ) my family
4.( ) 6:30
5.( ) morning
6.( )Monday
7.( )weekend
8.many ducks ( ) the lake
9.( ) school
10.( ) Jan.first
11.please wait ( ) the red light
12.( )USA
答6题再+5分
1.( ) year
2.( ) yesterday
3.( ) my family
4.( ) 6:30
5.( ) morning
6.( )Monday
7.( )weekend
8.many ducks ( ) the lake
9.( ) school
10.( ) Jan.first
11.please wait ( ) the red light
12.( )USA
答6题再+5分
问题解答：
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