介词或者副词填空.2'when you run__new words in reading,you dont have

2.across ; of ; up
解析：run across 撞见,碰见,偶然遇见(不期而遇); all of.. 全部...,所有... ； look up 好转；查(字典)；看望；(to)尊敬..均为习惯性用法.
5.for; to.
解析：for ever 永远,总是. contributions to 对...的贡献.均为习惯性用法.
10.(be) armed with 用 ... 武装起来; 装备有; 带着; start (out) for 动身往某处[for 表示方向.类似的搭配如：leave for 动身前往...]
12.at (具体时刻前用at); in .(在大街上：in the street,美语用：on the street)

against,of,up, what , to , with ,to ,at,over

across of up

across of up
for to
with to
at in
大概应该是这样。。
哈哈。。哈。。我跟你回答的一样，就是除了一个。10;Armed__food,water and a map,the children started out__the forest. 这个我是填写with for 我记得，start out for...