用括号内的适当 形式填空,并把答案写在横线上
1、Take the medicine _____(twotimes/twice) a day.
2 What's ____(wrong/matter) with him?
3 The boy is ____(feel/feeling) sick.
4 In summer,____（it/it's)often rains and it's wet.
5 Mary and I_____(am/are)good at swimming.