15.Do you think No2 is __________(难) of all the problems 16.We have some ________(困难)improving our English .第一个填什么好呢?

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15.Do you think No2 is __________(难) of all the problems 16.We have some ________(困难)improving our English .第一个填什么好呢?
15.Do you think No2 is __________(难) of all the problems
16.We have some ________(困难)improving our English .
第一个填什么好呢?

15.Do you think No2 is __________(难) of all the problems 16.We have some ________(困难)improving our English .第一个填什么好呢?
15.the hardest (one) 或 the most difficult (one)
括号内的one可写可不写
16.difficulty
此处difficulty为不可数名词,不能用复数形式.

15.Do you think No2 is the most difficult (或 the hardest )of all the problems ?
16.We have some difficulties improving our English .

15.difficult
16.difficuits

difficult be动词后面加形容词用difficult
difficulties some后面加名词difficulties是名词形式

the hardest