However, at times this balance in nature is ______, resulting in a number of unforeseen effects.
The secretary has a lot of things to ________ in the office since she has been away for quite a few days.
________ your composition carefully, some spelling mistakes can be avoided.
Ray is a new graduate, and it seems that he has difficulty in dealing with ________ problems arise.
- These apples look very beautiful.- They ________. See the price $ 3.99 a pound. Very expensive, aren’t they?
- Have you known each other for long?- Not really. ________ we started to work in this school.