—Must we keep the room_______ all the time?
—No, you don’t have to.
A.cleaning B.cleaned C. to clean D. clean
—He plays basketball so well! Who taught _______?
—He learnt it by _______.
A. him; him B. himself; himself C. him; himself D. himself; him
—_______ can I keep the books?
—Two weeks.
A.How long B.How often C.How far D.How soon
My mother often tells me _______ my classmates 
when
they need.
A.help B.to help C.helping D.helps
Do you prefer _______?
A.skate B.skates C.skating D.skated
You should _______ the doctor’s advice and _______ the medicine on time.
A. follow; eat B. follow; take C. take; eat D. eat; take
