At the evening party the host said _____ was able to solve the riddle could get a nice present as a reward.
| A．who | B．whoever |
| C．no matter who | D．whomever |
The UN has warned that,_____ natural systems like forests and wetlands disappear , mankind is losing the services they provide such as protection from extreme weather.
| A．while | B．once | C．when | D．as |
That fellow’s attitude towards others is _______ annoy nearly everyone he meets.
| A．such as to | B．so as to | C．such as | D．as to |
With many major economic problems_______ to be addressed, there is no point _______ the growth rate of this year now.
| A．remaining ; predicting | B．remaining ; to predict |
| C．remained ; predicting | D．remained ; to predict |
There is only one who is capable of setting limits to your growth, and it _____ well be you.
| A．may | B．should | C．will | D．must |
He had just lost his job when, at the precise moment, his girlfriend broke up with him. She ____ salt into his wound.
| A．rubbed | B．had rubbed | C．would rub | D．was rubbing |