He _______ English for four years before he went abroad.
Our school has developed a learning system students can do a lot of teamwork.
-We’re going camping this afternoon.--Enjoy yourselves! Take a map with you you get lost in the forest.
How much bread is there?-_____________.
Only when it is hungry ______ a human being.
Only _______ as an interpreter _______ how important it is to grasp English.