放在水平地面上的木箱重为600 N，受到水平向右150 N的推力时，恰好做匀速直线运动，在木箱下面垫上几根圆木后，仍然向右匀速运动，此时木箱受到的摩擦力____（选填“增大”、“减小”或“不变”），在水平方向上木箱受到的合力为____.

下图是绿色植物体内能量供应及利用的示意图，下列说法正确的是(   )

请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。

____ This shop sells all kinds of    ▲   from different countries.
____ I hear that her uncle has bought a new flat in the city centre    ▲   .
____ Jack won the    ▲   prize in the school reading contest and he felt very excited.
____ He had to make a    ▲   between staying with his parents and going abroad. 
____ You know Mike’s hobby is playing football, but    ▲   is collecting stamps.