The lake is calm and clear, and one of the things that _____in the water is the famous tower.

Both rice and wheat _______ grown in our country.

－          did you play the piano today?   －For five hours.

Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it comes to standard tests.

 It was not I but you who     the first to run to the goal in that competition.