In this speech the scientist _________ the gold medal to his first teacher.
| A．referred to offered | B．referred to offering | C．referred offer | D．referred offering |
--- Have you finished your homework?
--- No, I ______ my father on the farm all day yesterday.
| A．was helping | B．am helping |
| C．have helped | D．helped |
I often see him steal things from our supermarket. Do you think I ______ report it to the manager?
| A．can | B．will | C．should | D．may |
. --- Excuse me, but I want to use your computer to type a report.
--- You _____have my computer if you don't take care of it.
| A．shan't | B．might not | C．needn't | D．shouldn't |
--- Who is the girl standing over there?
--- Well, if you ______ know, her name is Mabel.
| A．may | B．can | C．must | D．shall |
Children under 12 years of age in that country _____ be under adult supervision when in a public library.
| A．must | B．may | C．can | D．need |