Mike has much difficulty ________ Chinese so he often asks me ________ help.
At the meeting they discussed three different ______ to the study of maths.
Studies show that the things that contribute most to a sense of happiness cannot be bought,______ a good family life,friendship and work satisfaction.
Can you imagine how late I went to bed last night?It was nearly 1 a.m.______ I finished my article.
The problem of global warming is serious.______,the sea levels have risen a little.
Though golden weeks over the past eight years have______huge returns for China's tourism industry,voices ______ cancellation of the nationwide holidays are becoming even stronger.