1 Students in Class One will act as guinea pigs among the new teaching reform.
2 Handmade lace is as rare as hen's teeth; most lace is made by machine.
3 Don't mention anything about that to your father. It's like a red rag to a bull.
4 If you say that to her, you will be stirring up a hornet's nest.
5 I thought he was going to have a cow when I told him I'd lost his key.
6 He was like a cat in hot bricks before his driving test.
7 The plan is a dead duck: there is no money.
8 The government should not waste money supporting lame ducks.
9 He is a real home bird. He seldom takes part in the social events.
10 He forgot the umbrella this morning and was caught in the rain like a drowned rat.
11 If you learn English parrot-fashion, you'll never know what English is.
12 Damian just isn't the violent type. He wouldn't hurt a fly.
13 He told us some cock-and-bull stories about having lost all his money.