Move the plants to a south-facing window, ________they can absorb daytime heat.

Why did you leave the water running in thesink —Mygoodness! I guess I ____ to turn off the tap

If we had taken such effective measures much earlier, the river ________ so seriously now.

May I borrow your computer?—Sorry, it is ________ at the moment

I need help _____my English,but I can help you______your Chinese.