—I wonder why the thinnest plastics bags, though ________ , are still in use here.—Well, it’s no easy job to solve this problem effectively.
The map is one of the best tools a man has _ _ he goes to a new place.
"Genius" is a complicated concept, _ _ many different factors.
- We've only got this small bookcase. Will that do? - No, _ _ I am looking for is something much bigger and stronger.
--- Was it by cutting down staff _ _she saved the firm? ----- No, it was by improving work efficiency.
The club, _ _ 25 years ago, is holding a party for past and present members.