Hi，Michelle， I can’t find my e-dictionary— Sorry，I itI guess I put it on the top shelf with my things

1—_______ your friend havea tennis racket—No, but hehas a great ping-pong bat collection.

My Biology teacher often us about the latest news of Ebola(埃博拉) .—We also learn a lot about it and we are a little worried.

Modern science has given clear evidence ______ smokingcan lead to many diseases.

It used to be thought _____ the Earth wasflat