The weather here is very cold, _______ in January and February.

Professor White has written some short stories, but he is________known for his plays. 

The famous professor’s lectures, though ____ informal, are considered far more informative and interesting.

Wang Ping hesitated for ___ before he ___ to the question.

—I think you can’t believe I had to pay $20   a haircut?—You should try the barber’s       I go. It’s only $5.