--- Please call me at 7:00 tomorrow morning. I’m kind of forgetful. --- Don’t worry about that. You’ll surely be ________.
—When could you have a meal with me ? —I’d like to go whenever it is______ to you.
Scientists have many theories about how the universe_______into being.
Cindy shut the door heavily and burst into tears. No one in the office knew ______she was so angry.
We can never expect_______bluer sky unless we create_______less polluted world.
The visit _____ to Guilin is worth remembering for ever.