这种新药对治疗头痛非常有效。

This new medicine is very ___effective in treating headaches.

新的交通规则将于下个月生效。

The new traffic regulations will be ___effective from next month.

她的新发型非常衬托气质，完美地修饰了她的脸型。

Her new hairstyle is very ___flattering, perfectly framing her face.