When you go outing with your sisters, you must see to_____ that they are safe. 　　[ ]

jumping is an adventurous sport,popular with young adults, —____couragematters more than strength．

What do you think of his words— What he said sounds _______ .

Nowadays,there is a____increase in children’s creativity, for they are greatlyencouraged to develop their talents[ ]

Wind power is an ancient source of energy ____we may return in the near future.