We rushed to the football court, only to see a sign ________ into the ground reading PERIODIC MAINTENANCE (定期维修).
---What do you enjoy most in life? ---____________ time _________ books. It’s really good fun.
____________the heavy snow in America, many people had to stay at the airport and couldn’t celebrate Cristmas with their family.
Although he is only 14 years old, he __________drugs for two years.
The children were not allowed ________ the house because it was being painted .
We had to wait one and half hours _________ we had already booked a table. A. since B. although C. until before