I. Complete the following sentences with could / couldn’t / should / shouldn’t / must + have +PP or should / must /can’t + infinitive. 1. Susan failed her Economics 201 last term._ She …………… (be) very upset. 2. This computer isn’t fast enough. _ I know I ……………(buy) a better one, but I didn’t have enough money when I bought this last month. 3. Why did you stay at a hotel when you went to New York? _You ……………(stay) with Barbara. 4. Jack fell off a ladder yesterday but he’s all right._ He’s lucky _ he …………….(hurt) himself badly. 5. The situation was bad but it …………… (be) worse. 6. You have been traveling all day. You ……………(be) tired. 7. I’ve lost one of my gloves. I ……………(drop) it somewhere. 8. Carol ……………(get) very bored in her job. She does the same thing everyday. 9. Jane walked past me without speaking. She ……………(see) me. 10. The phone rang but I didn’t hear it . I …………… (be) asleep.