---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 |
38. Mr. Black ______ home because his briefcase is still on the desk.
| A．mustn’t have gone | B．can’t have gone |
| C．shouldn’t have gone | D．needn’t have gone |
37. All animals, ______ their size, breathe once for every four heartbeats.
| A．however | B．whatever |
| C．no matter | D．in spite of |
36. ______ has helped to save the drowning girl is worth praising.
| A．Who | B．No matter who |
| C．Anyone | D．Whoever |
35. ______ the house prices have risen sharply, the number of buyers is as great as ever.
| A．Despite the fact that | B．In spite of what |
| C．Regardless of | D．Contrary to |
34. Is this the reason ______ at the meeting for his carelessness in his work?
| A．why he explained | B．he explained |
| C．what he explained | D．how he explained |