The apples on this tree are bigger thanon that one.

Dose the mooncake ______ nice ?— Yes, it’s really delicious !

Is the Youth Center open to the public yet?—Yes. It ______ for almost one and a half years.

The workers are trying to ________ what’s wrong with the machine.

Did you meet the professor at the airport?—No，he ____ by the time I ____ there．