用括号内所给动词的适当形式填空。

1. In their opinion, the Internet, if properly _____(manage), holds the key to success in the 21st century.

2. Production fell by 20% in May, _____(compare) to the same month of last year.

3. My cousin came to see me from the country, _____(bring) me a full basket of fresh fruits.

4. _____(retire) from the army, it took William a long time to adjust to civilian life.

5. I have never seen Beijing Opera _____(perform) so brilliantly.