We hung a net round the bed, which could protect us _____ mosquitoes and other insects.
When he joined them in the work, he was disappointed at there _______ so little to do.
He had a strange hairstyle and he instantly became the ______ of attention the moment he stepped into the classroom.
More money and effort should be spent to _______ the cultural relics in the world.
In communication, a smile is usually _____ strong sign of a friendly and _____ open attitude.
Surrounded by the armed police and having no way to escape ,the rebels (叛乱者) in Xinjiang Autonomous Region were forced to _____