People tend to love agricultural products ________ without the use of fertilizers, pesticides or chemical additives.
Do you have any idea ________
Last Sunday he made a promise ________ he was free he would take me to Qingdao.
Last Sunday he promised ________ today, but he hasn't appeared yet.
At that time I had no idea ________ I could hand it to him without being seen.
Now there is a danger ________ the ground may fall in under the heavy traffic.