16 Complete the questions and short answers. Must I apologise to her? – Yes, I must./No, I mustn't. 1. ______ you invite all of them? – Yes, you ______./ No, you ______. 2. ______ he take this exam? – Yes, he ______./ No, he ______. 3. ______ she go on business trips so often? – Yes, she ______./ No, she ______. 4. ______ it work so hard? – Yes, it ______./No, it ______. 5. ______ we pay these bills? – Yes, we ______./ No, we ______. 6. ______ they go on this excursion? – Yes, they ______./ No, they ______.