The ________ are on the sofa, and the ID card ________ under the bed.A. key; is B. keys; are C. keys; is
. As a volunteer, he often goes to the hospital to ________ the sick.
_______ of the students will take part in the sports meeting.
Trees and flowers ________every year to make our country more beautiful.
—Mr. Smith, would you please speak a little more ________? —Sorry! I thought you could follow me.
—Liu Qian is good at doing the tricks with the cards. —Yes, but if you watch carefully, you can see _______he does them.