根据句意，用所给动词的适当形式填空。We celebrate Christmas by _______ (send) cards to each other.
We should do as much as we can __________ (help) them out of trouble.
The whole class ___________ (divide) into four groups.
How much did you spend _________ (buy) the new bike?
The Green family __________ (have) supper at the table when I came into the house.
Whales are because some people make their ocean home dirty and others kill them for meat． （处于危险之中）
We will have a party in the classroom ． （后天）
Nowadays， many foreigners learning Chinese． （对……感兴趣）
are those who make you smile， always open their hearts to you and encourage you to succeed． （friend）
2018Football World Cup is being held in Russia now． It is the Football World Cup． （twenty-one）