Most birds find it safe to sleep in the trees, but ________they have eggs or young chicks, they don’t use a nest.

Nancy quickly ________ the door and put down her school things.

To greatly raise people’s living conditions, _______

‘s road traffic map is like a cobweb of small streets, offering drivers more _______ when one road is blocked.

Contrary to the opinion of the public, the chairman decided to appoint _______ he thought was equal to the job.