I don't think _________ possible to master a foreign language without much memory work.
I watched the plane go higher and higher until I lost _____ of it.
I usually take something to read when I travel by train _____I feel bored.
Out _____, with an apple in his hand.
Not until he met with the difficulty _______ the importance of group work.
The thief must have hidden somewhere in the _______ area.