At our factory there are a few machines similar to ________ described in this magazine.
He tried his best to solve the problem,________difficult it was.
On the bus I saw a studentI 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________.