Tu Youyou won Nobel Prize in Medicine for her discoveries that helped doctors fight malaria and _______ caused by roundworm parasites.
I am a determined person. ____ I have made up my mind, nothing can change my mind.
How often do you go swimming with your brother?
I was about to get on the bus _________someone called.
It was Mr Green _______ looked after my grandmother when I was on business.
Don’t ________when you are in trouble, you should be brave.