There ________ a ruler and two pens on the desk/

The number of people in the party _____fifty, but a number of them ____ absent for different reasons.

Riding on the swings and playing with the ducks in the pond _____ our children’s greatest pleasures when we took them to the park.

The ______ about the sports meeting make us excited.

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.