With online course Crazy English has over 20 million students all over China __________ the class through the Internet .
| A．attend | B．attended | C．attending | D．to be attending |
David applied for the position three times ____ he finally got it.
| A．until | B．when | C．before | D．after |
Many questions have been answered by John. He must have previewed the lessons last night, ____ he?
| A．needn’t | B．hasn’t | C．didn’t | D．mustn’t |
Look, ____ fashionable clothes is she wearing that all the eyes are fixed on her!
| A．so | B．such | C．how | D．what |
We the problem for a long time, but we didn’t reach any agreement.
| A．argued | B．explained | C．shared | D．communicated |
Though having lived abroad for years, many Chinese stillthe traditional customs.
| A．perform | B．pssess | C．observe | D．support |