Chang’e2 did many experiments, ______ I think are of much help for knowing space.
| A．which | B．what | C．when | D．where |
The precious paintings were hopelessly______ by long exposure in the cold, damp garage.
| A．harmed | B．ruined | C．damaged | D．injured |
_______ is no possibility________ the engineer can complete the project within two weeks.
| A．There; that | B．It; that | C．There; what | D．It; whether |
______ the crown of the second season of The Voice of China, Liqi devoted himself to practicing singing.
| A．Winning | B．Won | C．To win | D．Having won |
The students took the trouble _____ all the ______ leaves away.
| A．to clean, fallen | B．to clean, falling | C．cleaning, falling | D．cleaning, fallen |
--- Two tickets for Sunday.
--- Sorry, we’ve got _____ left.
| A．nothing | B．anything | C．no one | D．none |