Ⅰ.课文原句感知 1.Scientists have tried many ways (solve) this problem and in China，a mass campaign has been started (help) solve it. 2.The storms sometimes continue all day and traffic moves very slowly because the thick dust makes it difficult (see). 3.Weather experts advise people not (go) out.

◆语法感知

语法导学

to solve

to see

to go

to help