Nowadays, there arises growing concern over the issue of tainted vaccine(被感染的疫苗) ________ around China.

weather it is! We can’t go boating on the lake.— Don’t worry. Let’s go to the Science Museum instead.

The accident happened at nine o’clock in the morning ____ we were all busy with our work [ ]

I’ve shown you all the interesting and important places of our school.–Thank you for ______ so much time.

We arrived home at 9:00 in the evening, __________most people had already had supper.