The Yellow River is the second ______ one in China.
A. long B. longer C. longest D the longest
---Which month has _______ days in a year?
---February.
| A．the most | B．the longest |
| C．the fewest | D．the least |
What_______ honest boy! And he is_______ best student of all.
| A．an; / | B．an; a | C．a; the | D．an; the |
We were swimming in the lake _______ suddenly the storm started.
| A．until | B．while | C．when | D．Before |
The price of petrol(汽油) is not _______ that of last year, so some more people are planning to buy cars.
| A．as expensive as | B．so cheap as |
| C．as low as | D．so high as |
Everybody should study hard. No one can _______ us _______ a good future.
| A．provide; for | B．provide; with |
| C．keep; / | D．protect; to have |