Oh, boy, why are you just playing games all day? Can't you find something ______ doing at all?
-- Shall I go and buy more fruit for the party?-- No, I have already bought 3 baskets. That ____ be enough.
____ is often the case, the teacher has made the teaching plan before the new term.
– Would you please lend me some money?-- ____. I was not born with a silver spoon in my mouth.
The book was written ______ careful observations and detailed studies.
A short man appeared suddenly in the doorway, and Dave had to pull up __________ so as to avoid bumping into him.