He came __________ a good idea to help the old peopl.[ ]

Excuse me，but is that my dictionary?—Oh, sorry, I took________ by mistake.

The number of the students in our grade _______about six ______, ______ of them are girls.

Look! The police ______ the food onto the bank of the river.

_____ is no doubt _____ John’s knowledge of first aid saved Ms Slade’s life.