Not until all the fish died in the river how serious the problem of water pollution was.
| A．did they realize | B．they did realize | C．had they realized | D．they had realized |
Do you wake up every morning ____ energetic and ready to start a new day?
| A．feel | B．to feel | C．feeling | D．felt |
-- We could invite John and Barara to the Friday night party.
--Yes, ____? I’ll give them a call right now.
| A．why not | B．what for | C．why | D．what |
Try ___ she might, Sue couldn’t get the door open.
| A．if | B．when | C．since | D．as |
I’m sorry I didn’t phone you, but I’ve been very busy ___ the past couple of weeks.
| A．beyond | B．with | C．among | D．over |
The two girls are so alike that strangers find ____ difficult to tell one from the other.
| A．it | B．them | C．her | D．that |