One should remain ______ and think of ways to escape when facing danger

He hurried to the booking office only _____ that all the tickets had been sold out.[ ]

4 You will succeed in the end ____ you give up halfway

Just after putting the baby onto bed, MrsWhite suddenly caught sight of the pet cat and didn’t know how long it________ on the table for the family dinner

The teachers ________ themselves in marking the students’ papers after the monthly examination.[ ]