-- ________ do you study for a test?
-- By listening to the English programs every day.
| A．Why | B．When | C．Where | D．How |
By the end of last month, I _____ all the CDs of Justin Bieber.
| A．collect | B．collected | C．have collected | D．had collected |
You _____ lose your way if you walk alone in the mountains at night.
| A．may | B．need | C．should | D．ought to |
We didn’t start our discussion _____ everybody arrived.
| A．since | B．if | C．while | D．until |
Take the exam carefully, _____ you won’t get full marks.
| A．but | B．and | C．or | D．so |
We hope that with the help of the new skill, Liu Xiang can run _____ than before.
| A．fast | B．faster | C．fastest | D．the fastest |