I think _______ a foreign language is not easy. You should _______ it often.

It was the third time that she ______ to this mountain village to see the children

You_____tothemeetingthismorningifyouhavesomethingimportanttodo

In case of emergency, whether knowing how to apply first aid or not really ________ in matters concerning wounds like swollen wrists, broken arms, burns, cuts, and so on.[ ]

_____ from the plane, the Yellow River looks like a silk ribbon [ ]