Knowledge is there for _______ will seek it.
| A．who | B．whoever | C．whom | D．whomever |
_____ an ad does not lie, it does not mean it is altogether innocent.
| A．Even if | B．As if |
| C．If | D．Now that |
She set off at 9 a.m. and ____ the airport an hour later.
| A．will reach | B．would reach |
| C．had reached | D．reached |
If ____ in, viruses can result in illness or even death.
| A．breathe | B．breathing |
| C．breathed | D．to breathe |
By the 1920s, Howard Carter ____ an explorer.
| A．has become | B．had become |
| C．became | D．would become |
Three mountains, Meili, Baimang and Haba, _____ are covered with snow, tower over the land.
| A．that | B．what |
| C．which | D．as |