假设将两居室每套价格提高5万元，会减少多少购买者，如对此问题进行调查，则属于( )。

A．试探性调查
B．描述性调查
C．因果性调查
D．假设性调查

同义句转换。

1. I wish you a good trip to Hainan Island.

    I hope you _____ _____  in Hainan Island.

2. The bag is too heavy for me to carry.

    The bag is _____ heavy _____ I can't carry it.

3. Yesterday my father and I went to the Great Wall by bus.

    Yesterday my father and I _____ _____ _____ to the Great Wall.

4. Last year we went to Beijing for holiday.

    Last year we _____ _____ _____ in Beijing.

5. We got to New York yesterday morning.

    We _____ _____ New York yesterday morning.