Unreal past [matura final]

It’s high time you ......................... (start) doing homework on your own. 

• start

• started

• had started

If only I ................................................. (not / make) that mistake yesterday.

• hadn't made

• made

• makes

I ​ (a)   this box ​ (b)   so heavy – I can’t lift it.

• wish
• wasn't
• weren't
• wishes

I’d rather they (a)   (stop) talking about politics. 

We wish we (a)   (not / leave) the gate open. Now the dog has escaped.

It’s time we ​ (a)   something to make our garden more presentable. 

• did
• to do
• have done