I wonder _______. He seems to be very worried.— His favourite pen has gone missing and he is looking for it around the school.

Shanghai is bigger than_____in Jiangsu and bigger than______in China.

We found the ruins ____.

________ you understand this rule, you’ll have no further difficulty

How many lessons do you usually have a day? 　　—Six lessons a day. And each of them _____45 minutes.