The secretary arranged a(n) ______ time and space for the applicants to have an interview.
| A．important | B．convenient |
| C．public | D．Spare |
Scientists have many theories about how the universe_______into being.
| A．came | B．was coming | C．had come | D．would come |
Cindy shut the door heavily and burst into tears. No one in the office knew ______she was so angry.
| A．where | B．whether | C．that | D．why |
We can never expect_______bluer sky unless we create_______less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
The visit _____ to Guilin is worth remembering for ever.
| A．paid | B．paying | C．to pay | D．being paid |
Some children want to challenge themselves by learning a language different from their parents speak at home.
| A．what | B．that | C．which | D．one |