---I’m going to do        for your party. ---Sounds great!.

I visite Zhangjiajie during the summer vacation .It’s a pleasant trip, ____I’ll never forget. 

 Waves of red light are about twice as long as _______ of blue light.

 There isn't         in his room.

—Did you enjoy your tour around Beijing， Mr Singh？ —Yes. But I hate 　　　　 when the tour guide held out his left hand to shake hands with me.