—I’m not sure ______there are living things on other planets or not .—Even scientists aren’t sure about it.
He goes to work _______ 8:00 ________ the weekend .
My mother cooks ________. The food tastes really ___________.
Can you help me ________ my English?
Tom wants ________ you. Are you free?
She is good ______ music.She can be good _____ children in the music club.