单项选择题
The first textbooks for teaching English as a foreign language came out in the 16th century.
单项选择题 Poor ______ he is, he remains honest and kind.
单项选择题 Advertising is different from other forms of communication ______ the advertisers pay for the message to be delivered.
单项选择题 Perhaps we need to clear up these books to make ______ for our new students.
