All personnel should be familiar with the lifeboats _____.A.boarding and operating procedu

All member of the engineering watch shall be familiar with assigned watch－keeping dutiesIn

All the arrangements should be completed _______ y

听力原文：A government health study backs up what Mom has said all along, "you should be ea

An extensive foundation in the basic sciences should be required of all science students,

You should attend the meeting to be held in Beijing. The italicized part has all the follo

According to the author, learning should now be done in school for all the following reaso