Only when our country has aircraft carriers (航空母舰), _____________ our distant islands more effectively.
| A．we can guard | B．can we guard | C．we guard | D．do we guard |
The mere fact _____ most people believe nuclear war would be madness doesn’t mean that it will not occur.
| A．what | B．which | C．that | D．why |
I don’t doubt _____ he is a brilliant scientist, but can he teach?
| A．whether | B．if | C．that | D．what |
Criticism and self-criticism is necessary _____ it helps us to correct our mistakes.
| A．by that | B．at that | C．on that | D．in that |
_____ or not we had a baby, we couldn’t survive only on my salary.
| A．As | B．Even | C．However | D．Whether |
_____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.
| A．Now that | B．Ever since | C．So that | D．As long as |