They own two cars, not to ___ a motorbike.

下列句子中，没有语病的一项是（ ）

He was last seen _________in his office at about 7:15 p.m..

The boy is only , so his teacher lets him sit in the front row.

How far is the Palace Museum from here–It’s about four ______ drive. You can take a taxi there or you can take a walk.