________ to his experiment, he didn't notice that autumn had already come.
| A．Devote | B．Devoting |
| C．Devoted | D．To devote |
Catch the star that holds your fate , ______that forever twinkles within your heart.
| A．one | B．the one | C．it | D．that |
We have been excavating layers of ash almost six metres thick, which suggests that they________the fire burning all winter.
| A．should keep | B．might have kept | C．should have kept | D．might keep |
---Did you meet with the famous space hero, Yang Liwei?
---_____ I had come here earlier.
| A．If only | B．Only if | C．But for | D．Despite |
. --- Steve has got the first prize in the maths contest.
--- ______ is no wonder that he looks so happy today.
| A．It | B．That | C．This | D．There |
--- Has your brother returned from America yet?
--- Yes, but he ______ here for only three days before his company sent him to Africa.
| A．has been | B．was | C．will be | D．would be |