单项选择（每题1分）
She opened the window, _____ in some fresh air.
| A．letting | B．let | C．to let | D．to be let |
_________ happened to be no one in the building when the fire broke out.
| A．It | B．There | C．This | D．That |
The police got to ___ was once an old school ___the peasants used as a store .
| A．what , that | B．where , which | C．where , that | D．which , where |
．It’s not ____books you read but the way ____ you read them that decides how successfully you gain knowledge .
| A．a number of ; in which | B．the number of ; / |
| C．a good many ; which | D．quite a few ; in which |
Professor Smith has written some short stories , but he is _____known for his plays .
| A．better | B．more | C．best | D．most |
____that there is no opposition , I will report it to the general manager .
| A．To provide | B．Be provided | C．Having provided | D．Providing |