_____ well prepared you are, you still need a lot of luck in mountain climbing.
| A．However | B．Whatever | C．No matter | D．Although |
She was surprised to find the fridge empty；the children _____ everything !
| A．had been eating | B．had eaten |
| C．have eaten | D．have been eating |
There’s a ______in our office that when it’s somebody’s birthday，they bring in a cake for us all to share．
| A．tradition | B．balance | C．concern | D．relationship |
We've offered her the job，but I don’t know ____she’ll accept it．
| A．where | B．what | C．whether | D．which |
The old town has narrow streets and small houses _____are built close to each other．
| A．they | B．where | C．what | D．that |
When I got on the bus，I_____I had left my wallet at home．
| A．was realizing | B．realized | C．have realized | D．would realize |