----- Nội dung dịch tự động từ ảnh ----- Ex.2 Complete each sentence with a suitable word or phrase from the box. a) Police officers don't have to wear uniform when they are **on** duty. b) I feel very tired **at** times I consider giving up work. c) The children were all upset, and some were **in** tears. d) This factory needs modernising. Everything here is **out of** date. e) Don't worry, everything is **under** control. f) Sorry, I seem to have taken the wrong umbrella **by** mistake. g) Please hurry. We need these documents **without** delay. h) That wasn't an accident! You did it **on** purpose. i) We thought the two films were very similar **to** each other. j) We decided to take a holiday in Wales **for** a change.