I've locked the door. Ther're as safe as houses.
(as safe as houses means very safe)
（as safe as houses指十分安全）
I've been in seventh heaven ever since I got engaged!
(then in seventh heaven means extremely happy)
（then in seventh heaven指很幸福的）
If you have problems, call me 24/7;it doesn't matter if I'm sleeping.
(24/7 means at any time)
If you keep asking him about his ex-girlfriend, you'll be on thin ice.
(be on thin ice means in a risky situation)
（be on thin ice指处境危险）
If you think I'm going to climb that rickety ladder, you're all wet.
(all wet means completely mistaken)