6. “_________you like to play a game of tennis?” - “I’d love to.” A. Could B. Will C. Do D. Would 7. His letter is full of mistakes. He ___________the mistakes carefully before sending it. A. must have checked B. should have checked C. could have checked D. can have checked 8. “I bought two bottles of milk.” - “You _____ have bought milk; we have heaps of it in the house.” A. couldn't B. needn't C. mustn't D. hadn't 9. “I left my bike here and now it's gone.” – “Someone _____ borrowed it.” A. must have B. should have C. couldn't have D. needn't have 10. “Do you remember reading about it in the newspapers?” - “No, I _____abroad at the time.” A. must have been B. must be C. should be D. should have been 11. “The door was open.” - “It _______ been open. I had locked it myself and the key was in my pocket.” A. mustn't have B. must have C. can't have D. shouldn't have 12. The man was found unconscious at the foot of the cliff. He _____ have fallen 200 meters. A. needn't B. must C. should D. mustn't 13. “I heard their phone ringing.” - “You _____ hear phone ringing. They don't have a phone.” A. couldn't B. shouldn't C. mustn't D. needn't 14. When I’ve passed my driving test, I _____ hire a car from our local garage. A. will have B. would be able to C. can be able to D. will be able to 15. When the fog lifts, we _____ where we are. A. could see B. will be able to see C. must have seen D. are seeing 16. You _____ ring the bell; I have a key. A. may not B. needn't C. mustn't D. couldn't 17. You _______ drink this; it is poison. A. must B. needn't C. mustn't D. shouldn't