Alien had to call a taxi because the box was _____ to carry all the way home．

John likes walking in the open air, ______. [ ]

Jack, could you help me ________ these pictures on the blackboard? It may help us know more about the hazy weather. (雾霾) — With pleasure.

The price of an iphone 5 will be more than 5000 yuan.— Yes. Good things always ________ much.

This is _______ English class. I hope you can enjoy English.