It's a quarter past ten

(a)  

It's half past one

(a)  

It's half past three

(a)  

It's a quarter to five

(a)  

It's five o'clock

(a)  

It's a quarter past seven

(a)  

It's a quarter to twelve

(a)  

It's a quarter to nine

(a)  

It's a quarter past twelve

(a)