Complete the sentences with the appropriate form of the following words and phrases. involve be in charge deal look make sure be responsible 1. Marcel Lacour works for Research & Development. His job ..........developing new products and new ideas.
【简答题】n. 1 [C, usu. sing.] the edge of a circle or a round object or area 周边 2 [C, U] the distance measured around the edge of a circle or a round object or area 圆周;周长