Not until we left our school how warm it was there.
| A．had we realized | B．did we realize |
| C．have we realized | D．realized we |
Dogs have a very good_________ of smell and are often used to search for survivors in an earthquake.
| A．sense | B．view | C．means | D．idea |
I like to go to the opera __________.
| A．every now and then | B．sooner or later | C．more or less | D．in the end |
After five hours' drive, they reached __________ they thought was the place they'd been dreaming of.
| A．that | B．where | C．which | D．what |
He has given us a suggestion __________ we shouldbuy a cottage in the country with the money we have saved.
| A．when | B．where | C．what | D．that |
There's no __________in the way they do their accounts(记账).
| A．approaches | B．means | C．method | D．ways |