The factory ____ the students visited last week is the one ____ I have worked for thee years．

Had he spent more time practicing speaking English before, he _______ able to speak it much better now.

Would you like to tell me about the travel —Great. I really experienced ________.

My dog is very _________. It is safe to touchhim if you want to.

Old-fashioned phones matter when wireless networks __________ in disasters.