C15 U8 B

One of your co-workers hasn't shown up for a meeting. She may.............., or se could .................tied up in another meeting.

• have forgotten/ have got

• have forget/ have gotten

You've sent your friend several text messages. She hasn't replied. She must .............. my message. Her phone might ...................

• have not received/have died

• not have received/have died

A friend promised to return a book he borrowed. He hasn't. He is normally very reliable. He could...........it. On the other hand, he might .................. it yet.

• have lost it/not have finished

• not have finished/have lost it

A friend walked past you in the street and didn't stop to talk. She looked upset. She could................ you. She must ..............something on her mind.

• not have seen/have had

• have not seen/have had

Your brother is supposed to drive you to the airport. He's already 20 minutes late. His car must ...............down. Or he may...................

• have broke/not have remembered

• have broken/not have remembered