So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.
| A．many of which | B．many of whom | C．many of that | D．many of them |
The light is still on. They ___ to turn it off when they left the room.
| A．must forget | B．could have forgotten |
| C．may forget | D．must have forgotten |
I often have conversation with John over _____ phone, but keep in touch with Tom by writing _____ letters.
| A．/; the | B．/; a | C．the; / | D．the; a |
Whenever I was in trouble, he would do what he could _____ me.
| A．help | B．helping | C．to help | D．helped |
The speaker raised his voice but still couldn’t make himself ______.
| A．heard | B．to hear | C．hearing | D．hear |
You ____ television．Why not do something more active?
| A．always watch | B．are always watching |
| C．have always watched | D．have always been watching |