【題目】Our new English teacher speaks English very fast and I sometimes have difficulty __________ to what he says.

【題目】_________ reading books is rewarding on the whole, not all books are necessarily good for children.

【題目】_________ the hard work in the past few months, the crops wouldn’t grow so well now.

【題目】_________ is generally believed, it is human activities that have contributed to the global warming.

【題目】There is a general among teachers about the need for greater security in schools.

【題目】Mike was usually so careful, this time he made a small mistake.

【題目】Happiness and success often come to those are good at recognizing their own strengths.