—–I think the man over there must be Tom.—–It _____ be him. He has ______ to America.
| A．can’t；gone | B．can’t；been |
| C．may not；been | D．mustn’t；gone |
Mr. Wu___this math problem____him many times, but he still doesn’t understand it.
| A．explains ; to | B．has explained ; for | C．has explained ; to | D．explained ; with |
Bob doesn’t know ________ to write about.
| A．how | B．that | C．what | D．Where |
--How many students have passed the examination? -- _______.
| A．No one | B．None | C．Nobody | D．Nothing |
_________ creates the feeling of harmony and also represents sadness.
| A．Red | B．White | C．Blue | D．Yellow |
My grandma _________ Chinese food ________ Western food.
| A．would rather, than | B．prefers, than | C．would rather, to | D．prefers, to |