Nhận biết các chất sau: NaOH, Ba(OH)2, NaCl, BaCl2

Có thể làm cho một mảnh nilon nhiễm điện bằng cách nào?

A.Nung nóng mảnh nilon

B.Cọ xát mảnh nilon với len

C.Thả mảnh nilon vào nước

D.Đặt nam châm gần mảnh nilon

Choose the best option to complete these sentences

1.(Although/ However/ Therefore) the film was a bit frightening, I really enjoyed it.

2.In spite of (have/ to have/ having) a happy (acting/ setting/ ending), the film begins with a terrible disaster.

3.I'm sure you'll find the film (amuse/ amused/ amusing).

4.The boy was so (frightened/ frighting/ frighten) by the film that he couldn't sleep last night.

5.Does your bike ever (take/ turn/ break) down on the way to school?