He couldn't do his lesson. I... explain some things to him. a) must, b) have to, c) had to, d) shall have to 4. When the bell..., she... her report, a) rang; had finished, b) has…

He couldn't do his lesson. I... explain some things to him. a) must, b) have to, c) had to, d) shall have to 4. When the bell..., she... her report, a) rang; had finished, b) has rung; has finished, c) had rung; had finished, d) had rang; had finished 5. When we... the light in the windows, he... from the cinema. a) have seen; has returned, b) saw; returned, c) have seen; had returned, d) saw; had returned 6. These pills... with water. a) must be taken, b) must be to take, c) must to be taken, d) must taken 7. "How old are you?" she said. a) She asked how old am I. b) She asked how old I am. c) She asked how old I was. d) She asked hoe old was I.