You can’t get in. The exam _________ for over30 minutes.

The air pollution is terrible.–It will be worse_______ we take action to protect the environment.

The traditional approach __________ with complex problems is to break them down into smaller，more easily managed problems

The woman said he _____ to use yellow to remind him_______ a warm sunny day.

rst thing you must remember is that in order to succeed, it is almost compulsory that you ______ optimistic.