___________ do you go to the English club?-Once a week.[ ]

It is said that the gravity on Mars is only about __________ of the gravity on earth．

Tracy doesn’t know many people here. – ______, we have stayed here for only two days.

The terrorists（恐怖分子）in Xinjiang ______ last month.

The workers were made ______ all day and all night by bosses in the old days.