–How do you keep in touch with your old classmates or schoolmates? -- By chatting with them on the Internet, _______for three hours every day.
Many people have helped with canned food, however, the food bank needs _____ for the poor.
It is generally believed that reading is_________ it is a science.
It's always difficult being in a foreign country, _____if you don't speak the language.
_______to take this adventure course will certainly learn a lot of useful skills.
We decided not to climb the mountains because it was raining________.