Peter doesn’t know many people here.— __________.

Lots of the scientists in our country are working hard to ____the planet Mars .

In that school, English is compulsory for all students, but French and Russian are________.[ ]

at the back of the temple is the Tianning Tower, which, _____154 metres into the sky, is the tallest tower of the kind in China.

The skirt looks different from others andit is nice.—Thanks. It ______ by my mother last month.