Space exploration began in the 1960s, and since then about five hundred people into space.
| A．have traveled | B．traveled | C．had traveled | D．are traveling |
Painting from still images leads to a loss of sensitivity, which is _______ to an artist.
| A．absolute | B．urgent |
| C．special | D．vital |
She loves the song _______, because her mother was once the singer of it.
| A．in particular | B．in theory |
| C．in practice | D．in secret |
Next door to ours _______, who has just returned from abroad.
| A．where lives an old man |
| B．where does the old man live |
| C．lives an old man |
| D．does an old man live |
There was a long queue for coffee. Having waited for 10 minutes, we _______ gave up.
| A．absolutely | B．actually |
| C．eventually | D．occasionally |
—Mum, I can’t see any point in studying hard.
—Come on, dear. Years of hard study will surely _______ in your future career.
| A．make sure | B．pay off |
| C．bring back | D．pay back |