Someone called me up in the middle of the night, but he hung up ______ I could answer the phone.

We can go hiking next week ____ it rains heavily.

--There             so many foreigners in the streets these days.-- They might be runners in the Yellow River Estuary (入海口，河口) International Marathon.

—Dongdong, ____ toy car is that?         —It’s ____.

I stayed at home .I went      to the park      to the cinema.