1.Translate the following expressions into English.
（1）提出建議
suggest
suggest
（2）向....捐贈....
donate to
donate to
（3）保持平衡
keep a balance
keep a balance
（4）確保；保證
make sure
make sure
（5）參與（某事）
take part in
take part in
（6）讓步；屈服
give way to
give way to
（7）導(dǎo)致
lead to
lead to
（8）向……求助
turn to
turn to
（9）阻止；不準(zhǔn)
prevent
prevent
（10）（為..... ）作貢獻(xiàn)
contribute to
contribute to
2.Complete the following sentences with proper forms of the expressions in Exercise I .
（1）He should
give way to
give way to
a younger，more decisive leader.
（2）In this case we have no choice，but to
turn to
turn to
others
（3）I believe that each of us can
contribute to
contribute to
the future of the world.
（4）You find one thing out and it can
lead to
lead to
something else.
（5）I
suggest
suggest
that we（should） hold a meeting next week.
（6）We hope to
prevent
prevent
anything unpleasant happening.
（7）Some have even said they would
donate to
donate to
the Red Cross again.
（8）It is a great honour to be invited to
take part in
take part in
this educational tour.
（9）If you have questions about what you see
make sure
make sure
to ask your instructor.
（10）In my opinion，we should
keep a balance
keep a balance
between amusement and study or work.
