A mobile phone is a________ when you travel alone. A: must-have B: must C: need

He looks tired. He ______ a sleepless night. A: must have been B: must have had C: must be D: must have

There is no one answering the phone. He ___ left home. A: have must B: must C: must have

The next morning a pilot flying overhead________. A: must have seen the letters 'SOS' in the snow B: must have seen the woman C: must have seen the wrecked plane D: must have seen the children

The construction of the laboratory ________ by the end of July. A: must be completing B: must complete C: must have complete D: must have been completed

The construction of the laboratory ______ before the end of next month. A: must complete B: must be completed C: must have completed D: must have been completed

Where ________ Mary have put the empty bottles? -She ________ them away. They must be somewhere. A: can; can't have thrown B: must; needn't C: must; must have thrown D: can; mustn't have thrown

“____ he have left yesterday?” Yes, he ____<br/>yesterday.” No, he ____ yesterday.” A: Must; must have left; can’t have left B: Can; can have<br/>left; can’t have left C: Can; must have left; can’t have left D: May; must<br/>have left; shouldn’t have left

I can't find the kid anywhere. He to his uncle's. A: must go B: must have gone to C: must have been to D: must be

There is no one answering the phone. He___ left home. A: must B: could have C: must have