选择下列单词或词组填入每句的空格中。每空格限填—词,每词只能填—次。
A. bad B. Perhaps C. outdoor activity
D. practise swimming E. in spring F. careful
1.Running is Mark's favourite ________.
2.Susan had a ________ cold. She went to see a doctor.
3.________ my son will be an astronaut in the future.
4.We ________ three times a week.
5.It's a good idea to have a picnic ________.
6.In London, traffic keeps to the left, so you should be ________.