I think we should by some canned food before a typhoon

1) I think we should by some canned food before a typhoon.
=> I suggest that some___________________________
2) My advice to you is this: try to relax before the exam.
=> If_____________________________________
3) She escaped in a car. Its paint is black.
=> The car in_______________________________
4) A lot of people pour into streets during the rush hour, so there are often traffic jams.
=> Since______________________________
5) The last time she worn that dress was on her sister's wedding.
=> That dress hasn't___________________________________