–Mary, could you tell me if your mother _____ our school sports meeting tomorrow? --I think she will come to school if she _____ free.
I’m sorry I’m late for work _______ the heavy traffic this morning.
----The number of the tigers is getting __________. ---- I agree _______ you.
The reserve is an important ______ area for the rare red-crowned cranes.
You should speak as loudly as you can _____everyone hear you clearly
I think ____necessary for us _____the birds.