Twenty-five percent of the water in this river _____ dirty in the past.
A. is B are C. was D. were
-- ____have you lived in this beautiful city? -- For six years.
| A．How long | B．How often | C．How many | D．How much |
The accident happened _________ an autumn early morning.
| A．in | B．at | C．on | D．for |
-- How many cakes can I have, Mum? -- _______, dear. They were prepared for your father.
| A．Both | B．Either | C．None | D．All |
-- Can I borrow your dictionary? -- Sorry, I don’t have __________.
| A．it | B．one | C．that | D．this |
Mo Yan, ________ordinary-looking writer from Shandong, China, was presented the Nobel Prize for Literature last year.
| A．a | B．an | C．the | D．/ |