Can you tell me _____ the birdwatchers in Zhalong Nature Reserve? I only know that _____ of them are from our school.
Using his hybrid rice, farmers are producing harvests before.
Why do you keep the windows open on such a cold day? —There are so many students here, so we want to keep the air nice and __.
Turn the radio ______, please! The baby has just fallen asleep.
After class I have gymnastics two hours.[ ]