--- This must be a footprint of a tiger.
--- It ____ be. A tiger’s should be much larger and deeper than this.
| A．mustn’t | B．won’t | C．shan’t | D．can’t |
He has been working hard day and night, which, of course,his tiredness.
| A．accounts for | B．answers for | C．applies for | D．stands for |
Could I do some explanations? Ito call on you last night, but somebody came to see me just when I was to about leave.
| A．would intend | B．intended | C．had intended | D．was intending |
His parents, , didn’t look after him very well—the elbows of his jacket and his boots were badly worn out.
| A．generally | B．apparently | C．gradually | D．precisely |
After months of voyage, Columbus arrived inlater proved a new continent.
| A．what | B．where | C．that | D．which |
—Are you satisfied with what he has done?
—Not in the least. It couldn’t be.
| A．So bad | B．much better | C．the best | D．any worse |