【正文】
nd it difficult to do sth. although so...that... so that 引導(dǎo)目的狀語從句 — How 引導(dǎo)的特殊疑問句 — By doing… — Do you…. ? — Yes, I do. How often…. Do a survey Do a survey and fill in the blanks in P4. 。 ( 2) travel by air ( land , sea) 航空(陸路、航海)旅行。 ( 2)沿著、經(jīng)由 e by the highwa