It is very _________(consider)of you to send me a birthday card

)Neurons grow ________ the brain is working to solve the problem

______ the maths problem is difficult, I’ll try very hard to work it out虽然这道数学很难，我会尽力将它做出来的。

Many of the students ______ the work although it took some time to learn how to do it.

The ratio of the work done by the machine______________the work done on it is called the efficiency of the machine.

— ______ ?　　—Thank you.It’s very kind of you.

1．_________I came in，Jimmy had already worked out the maths problem．

—Who told you that?—It’s a friend of your _____.—If that, it’s not the friend of my _____.

—Who told you that?—It’s a friend of your ______. —If that, it’s not the friend of my ______.

5．_______students can work out the math problem，it is too hard．