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 ________.