植物根尖吸收水和无机盐的主要部位是成熟区 。                   

I st____d____(学习)English two years ago.

①家具安装说明书     ②学校课程表

③产品加工工序表     ④零件的三视图

用所给词的正确形式填空。
There is a great chance for you____ (meet) the famous athlete .
It’s easy for you ____  (finish) the work on computers .
There are many birds ____  (sing) happily in the tree .
They spent a long time ____  (argue) about the boring things .
I ____ (visit) my good friend at this time last night .