Some languages，________ Russian and German，are not easy to learn.
| A．for example | B．such as |
| C．as | D．that is |
Here are three balls, ___?
| A．which one is the bigger | B．what ball is the bigger | C．which one is the biggest | D．what ball is biggest |
__ you study, ___ you will learn.
| A．Harder….harder | B．The more… the harder | C．The hard.. the more | D．The harder.. the more |
He goes there __ than I .
| A．often | B．more oftener | C．more often | D．as often as |
Would you be __ kind as to lend me a hand?
| A．as | B．very | C．so | D．too |
Of all the studetts, he prepares his lessons ___.
| A．most carefully | B．more carefully | C．much carefully | D．most careful |