I didn’t quite follow him because he explained the theory _____that is too abstract for me.
I don’t know who invented ________ telephone. It’s really ________ most useful invention.
----Whose advice do you think I should take? ----________.
Could you show me the TV set you’d like ________?
When somewhat better ________ academically, he returned home to continue his research.
This new teaching approach is specially ______ to develop children’s problem-solving skills.