选词组填空（共5小题；每小题2分，满分10分）。
1.While ____________ a knife to cut something, you need to be very careful.
2. After the earthquake, the whole city ____________.
3. Has she _____________ to improve her terrible handwriting?      
4. _____________ get the first prize in the sport meeting, he insists on practicing every day.
5. Ever since he was put into prison, he _____________ a lot of sufferings.