--Children should not play football in the streets. --_______. It’s dangerous.
—How do you learn English, Tony?—I often practice English _____ chatting ______ my American friends.
She is a ___________ girl. And she does everything ___________.
We walked for ___________ hours before we got to the top of the mountain.
Only ___________ the students exercise for more than half an hour every day.
My parents love me ___________ they don’t have much time to stay with me.