---Look，what a mess in the kitchen！
---I ______cooking fish in a new way and I really have no time to tidy it up now.
| A．tried | B．had tried |
| C．will try | D．have been trying |
“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
| A．might fall out | B．could fall out |
| C．should have fallen out | D．must have fallen out |
“Is there a flight to London this evening？” “There _______ be. I’ll phone the airport and find it out.”
| A．must | B．might |
| C．would | D．can |
“You ______ your teacher for help. He is kind-hearted.” “Yes. A whole day _______.”
| A．can ask, will waste |
| B．must have asked, had wasted |
| C．could have asked, was wasted |
| D．shouldn’t have asked, would be wasted |
Why did you just sit and watch？ You _______ me.
| A．could help | B．should help |
| C．could have helped | D．must have helped |
“Why didn’t she come to the meeting yesterday？” “I’m not so sure. She ______ ill.”
| A．should be | B．should have been |
| C．must be | D．might have been |