a language requires time and effort.
| A．Learn | B．Learning | C． To learn | D． Being learned |
The main cause of HIV / AIDS infection in China is drug abuse, ______ is very serious in Yunnan.
| A．what | B．who | C．that | D．which |
It is reported that some mainland visitors to Hong Kong Disneyland didn't _______ the park rules and behaved improperly.
| A．get across | B．keep to | C．take up | D．make up |
Signnatel Inc, ______ world's largest maker of controller chips for MP3 players, is set to establish _______ new R & D centre in Hong Kong and open two sales offices on China's mainland.
| A．the; a | B．the; the | C．a; the | D．a; a |
The two old sisters，_______ so long，held each other and burst into tears．
| A．being separated | B．having been separated |
| C．having separated | D．had been separated |
— When will you leave for Paris for a visit?
— ____next month.
| A．Until | B．After | C．At | D．In |