I________，but I didn’t________anything．
| A．listened；listen |
| B．heard；hear |
| C．heard；listen |
| D．listened；hear |
I don’t remember________the book yesterday．
| A．where I put |
| B．where did I put |
| C．where will I put |
| D．where I will put |
—Mum，it’s late．Why are you still here？
—Dad hasn’t come back yet．I________for him．
A．am waiting
B．was waiting
C．waited
They have fun________their homework all the time．
| A．do |
| B．to do |
| C．doing |
| D．to doing |
Thanks for helping me________out that problem．
| A．work |
| B．working |
| C．works |
| D．to working |