By using your eyes you can tell the direction _____ light comes.
When I got back home I saw a note pinned to the door, ________ “Sorry to miss you; I will call you later.”
________ with conducting an interview by QQ online, a facetoface interview in person can provide people with more reliable details.
More children in Beijing will reach school age next year, ________ a shortage of primary school teachers in the capital.
It is necessary that we keep the young generation ________ of the current affairs.
Studies show that students often ________ to too much pressure tend to develop mental problems.