Dogs are kept to ______ the houses from thieves at night.

(2013·宿州模拟)QQ, 　　　you can chat with your friends, makes communication easy.

There is no doubt, in my opinion, ________matters is not the speed, but the quality of the products. [ ]

Tom had to______ the invitation to the party last weekend because he was too busy.

I __________to read, so I always put my________to gooduse by working in the after-school care center at her elementaryschool.