---Who can it be that hasn’t handed in his composition?
---It ______ be Robinson. He ______ it in yesterday.
| A．will; should hand | B．must; should have handed |
| C．may; can’t hand | D．can; could have handed |
The Prime Minister refused to comment on the rumor that he had planned to _____.
| A．discharge | B．dismiss | C．resign | D．resume |
Professor Jordon is well known for his _____ into the habits of the common housefly.
| A．examination | B．introduction |
| C．research | D．expression |
. I support your decision, but I should also make it clear that I am not going to be _____ to it.
| A．connected | B．fastened | C．bound | D．stuck |
John _____ knowledge of radio just by staying around the radio station.
| A．caught on | B．worked up | C．took up | D．picked up |
| A．densely | B．soundly | C．loudly | D．noisily |