Would you mind if I _____here? I’m sorry, you’d better not.
-Can I join Oxfam Trailwalker? -Only if you are ________ eighteen.
-Must we leave now? -No, we ________. We still have two more hours.
-What’s your plan for this weekend? -I’m going to ________ it with my grandparents.
-Do you know _______ World Water Day is? -On March 22nd.
Mr Wang has worked as _______ English teacher for more than 10 years.