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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.