I thought _______ very useful to know the customs of foreign countries.
A：that
B： to coming
C：it
D：to go
被称为地球之“肺”的是（ ）
世界的气候是复杂多样的，受到了位置、地形等多种因素的共同影响。回答下题。
Mike has no time to buy a gift for Alice. So he doesn’t know _______ her birthday party.
