Did you do_________ last weekend?
If daddy ____, we will go to the mountains tomorrow.
My grandma started using Weibo at the age of 70. She always says it’s never ____ old to start doing things.
David lives a very simple life ____ he has a lot of money.
More often, the air in Hangzhou is dirty because of _____.
If there is a will, there is a way to get the trouble ______.