My mom suggest that we           eat out for a change this weekend.

should

might

could

would

考查虚拟语气。句意：我妈妈建议我们这周末出去吃饭换换口味。suggest作“建议”时，后面的宾语从句要用虚拟语气（should）+动词原形。故选A项。

As a matter of fact,           beauty of           nature there made an excellent impression on me.

a; the; /

a; the; the

the; the; /

a; /; the

考察冠词。句意：事实上，那里的自然之美给我留下了极好的印象。as a matter of fact “ 事实上”，为固定短语。第二个空表示特指，用定冠词the。Nature表示“大自然，自然界”时，前面一般不加冠词。故选A项。

______about wild plants that they decided to make a trip to Madagascar for further research.

So curious the couple was

So curious were the couple

How curious the couple were

The couple was such curious

It’s his brother ______ never been to Australia. You’d better take him with you.

that is

who is

that have 　

 who has

句意：就是他的弟弟从没去过澳大利亚。你最好带他和你去。根据句意及题干分析此题是考查强调句型，因为强调的是his brother，是人，所以用who引导是现在完成时态，故选D。