for, waited, half, they, an hour
_________________________________.
When Tom knocked at the door, I was busy ________ a model plane with my brother.
A.making B.make C.to make D.made
I think it's important for you________ the chance. It may be helpful for your future.
A.catch B.to catch C.catching D.caught
Don't forget ________ a message to Mr. John if he is not in the office.
A.to leave B.leave C.leaving D.left
When I was in trouble, my parents taught me________ up from where I had fallen down.
A.stand B.to stand C.stood D.standing
Our teacher always advises us________ the habit of taking notes, because it can help us learn better.
A.to develop B.develop C.developing D.developed
