For forty years Jane has been ___________ about making the rest of the world understand and respect the life of these animals.
He tried his best to solve the problem,________difficult it was.
On the bus I saw a student I thought was your brother.
— Guess what? I went to Hainan Island last weekend.— Really? You a wonderful time.
He was badly ill but to comfort his parents,he ________ an excuse that he was too tired.
From the ________ look of the boys,I found they were________.