Our .English teacher is our favorite. She’s kind and humorous, but____, she is strict with us.
Some insects_____ the colour of their surroundings (环境) to protect themselves.
_____ is known to everybody, the moon travels round the earth once every month.
We are invited to a party _________in our club next Friday.
It sounds like something is wrong with the car’s engine. ______ , we’d better take it to the garage immediately.
It is illegal for a public official (政府官员) to ask people for gifts or money_____ favors(恩惠,帮助) to them.