--What you for your vacation? --I plan to visit my grandparents.
I think _________ necessary for students to take an interest in all subjects.
Lanmon _________ here for almost ten years and he has many Chinese friends.
If everyone pours less polluted water into Dianchi Lake, it will be _______.
It’s raining outside! Put on your raincoat, ________ you’ll get wet.
We are organizing a lot of activities to celebrate the _______ birthday of the Communist Party of China these months.