Professor White has written some short stories, but he is _____ known for his plays.
| A．the best | B．more | C．better | D．the most |
Mr. Lee, who as a carpenter for over 10 years, is now a very famous statesman in this country.
| A．has worked | B．had worked | C．worked | D．works |
Helping others is a habit, you can learn even at an early age.
| A．it | B．that | C．what | D．one |
Vitamin D helps our bodies make a special chemical, and this special chemical, ________, affects our brains, making us feel happy.
| A．in turn | B．in particular | C．in advance | D．in short |
Don’t worry about the child. Next to him ________ a lady, _______ he can turn when he is in trouble.
| A．sits; whom | B．sits; to whom |
| C．is sitting; with whom | D．was sitting; to whom |
The girl had hardly rung the bell the door was opened suddenly, and her friend rushed out to greet her.
| A．before | B．until | C．as | D．since |