All the donated money should be made full use _______the homeless people in Ya’an city of Sichuan province.

Mr. Brown has worked in the factory ______15 years. [ ]

What ________ useful book ! —Yes, it is. But I found___________ difficult for me to read.

There ______ a dolphin show in the zoo tomorrow evening.

Mum, can I wear my jeans to school?–No, you ________ wear school uniforms. That’s the school rule.