_____the teacher couldn’t understand was _____ fewer and fewer students showed interest in his class.
This chapter is so difficult to ______ that I shall have to read it again later.
I lost my ______ and fell off the bike.
---Do you know where David is? I couldn’t find him anywhere. ---Well. He ______ have gone far----his coat’s still here.
You can’t imagine that a well-behaved gentleman _____ be so rude to a lady.
His glasses, ________ he was like a blind man, fell to the ground and broke.