As a student of Senior Three, he has very little free time _________ he can spend developing his own interest.
| A．when | B．in which |
| C．at which | D．that |
The new education system is said to be _______ to the successful development of the country.
| A．apparent | B．central | C．allergic | D．generous |
— Who has done that again?
— _______ you ask? Little Tom, of course!
| A．Might | B．Can | C．Would | D．Need |
The TV show, “Daddy, where are we going?”, _______ across China, especially popular on the major Chinese websites.
| A．exploded | B．slipped | C．leaked | D．trembled |
I have a big dream — I want to go into space, _______ will take some time to realize, I guess.
| A．which | B．it | C．what | D．where |
Although I majored in English, language _______ became a challenge when I set foot in the USA for the first time.
| A．luckily | B．naturally | C．surprisingly | D．gradually |