Although he’s over 70, he is full of energy.
--- Why do you often take exercise? --- _____ me keep fit.
--- We went to see the man who was in hospital yesterday. --- __________.
If H2 burn in O2, we can get _____.
The boy read the article ________ and found something important in it.
--- I’m sure I will get good marks in the final exam.--- I believe your parents will ______ your study if you try your best.