Mr. Brown is an experienced doctor. He is always when faced with emergency.
---I find reading comprehension the hardest in learning a foreign language. ---Well, you’d better practise reading short passage every day.
One of the sides of the board should be painted yellow, and .
---How can I get to the island you mentioned? ---You can’t get there by swimming.
. One of the students hasn’t prepared lessons very well.
the end of last term, every student in the school, I think, has taken at least five maths tests.