新提升·课时作业
Ⅰ.单句语法填空
1．We must do something to prevent the river ________ (pollute)．
2．You are lucky enough to escape ________ (punish) after making such a mistake.
3．—Frank, what do you usually do at the weather station?
—I set ________ temperatures at 8 and 12 o'clock every day in the notebook.
