Ⅰ.介词填空
1．We didn't go to bed ________ twelve last night.
答案：until
2．There is a blackboard ________ the front of our classroom.
答案：in
3．My father will be back ________ three days.
答案：in
4．There is a bridge ________ the river.We can go across the river easily.
答案：over
5． The sun sinks _______ _ the horizon. The night falls.
答案：belo w
6．They walked ________ the playground and came to the dining room.
答案：across
7．I walked ________ the forest, tired and hungry.
答案：through
