—How about paying a visit to Mr. Richardson, our former history teacher?—Good idea. I will e-mail him today so he ___ know ___ to expect us.
Chengdu No. 7 High School, _____________ in 1905, is home to a great many excellent students.
The old man has two sons, __________ lives with him, so he has always felt lonely since his wife’s death.
No matter where he is, he makes ________ a rule to go for a walk before breakfast.
It is said that ________ wool product in Australia is of _________ high quality.
-- You know I dropped medicine and __________ physics. --- You made a right decision.