These tables and desks are all made of_____.
The school has developed an online systemstudents can choose their own teachers.
We’d better stay here a little longerhe turns up unexpectedly.
---I’m sorry, but there is no smoking on this flight. ---Oh, I _____that. Sorry, I won’t again. A. don’t know B didn’t know C. won’t know D. haven’t known
It was in the garden of the old house _____ he bought last year ______he dug up a pot of gold.
—What is your plan for the holiday, Paul? —I’ll go on a trip to Jiangxi Province with my family. —______!