—Have you known Dr. Jackson for a long time?
—Yes, since she________ the Chinese Society.
| A．has joined | B．joins | C．had joined | D．joined |
________hard you try, it is difficult to lose weight without cutting down the amount you eat.
| A．Whatever | B．However | C．Whichever | D．Whenever |
I appreciate ______when she offered to help.
| A．it | B．that | C．one | D．ones |
----Does this dress fit Mary?
----I don’t know. She is very _______about what she wears.
| A．especial | B．special | C．particular | D．unusual |
Only then __________how much damage had been caused.
| A．she realized | B．she had realized |
| C．had she realized | D．did she realize |
To understand the grammar of the sentence, you must break it ______into parts.
| A．up | B．out | C．off | D．down |