The newcomers still don’t know ________ the difficult situation after practicing for 2 months.

My mother suggested that not only ______ study hard myself but also _____help my sister. [ ]

下列各句中，没有语病的一句是（ ）

The traffic problem we are looking forward to seeing ____ should have attracted the localgovernment’s attention [ ]

Oh, doctor, the wound on my leg is infected.—You really shouldn’t have left it _______ to the sun.