19.  Don’t tell anyone what I said.   
⇒ I’d rather you............………….........................................…. 
20. It is high time we went home. 
⇒ It is high time ………………………………………………......
21. You really should be able to dress yourself by now 
⇒ It’s high time ………………………………………………….. 
22. It is high time for you to go to school.  
⇒ It’s about ………………………………………………….. 

Cho hai số thực dương x y thỏa mãn x+y=1. Tìm giá trị nhỏ nhất của A=xy+\(\dfrac{1}{xy}\)