If there are micro－seized areas on the liner or skirt scratch－over manually with a coarse carbo－rundum stone （grindstone), moving the grindstone ____ at an angle of 20 to 30 degrees to horizontal.

If over a period of time, the oi1 film partially disappears, so that dry areas are formed

There are reports that pupils in some areas were ______ to participate in welcome ceremoni

There are few, _____, mistakes in the book.A: if someB: if manyC: if anyD: if few

If there are more animals in a certain area than______ to support them, some of the animal

If there are questions the students will_______.A

If there are questions the students will_________