________ you have problems, just let me know. I'll always be there for you.
A.However B.Whatever C.Whenever
We are glad ________ that traditional Chinese medicine can work wonders in preventing some diseases.
A.know B.to know C.knowing
A Chinese survey team reached the top of Mount Qomolangma ________ May 27th, 2020, which will improve human knowledge of nature and scientific development.
A.at B.on C.in
________ your smartphones, and read for at least 30 minutes, every day! You know, reading helps us to deepen our spiritual world.
A.Put away B.To put away C.Putting away
— What happened to Mrs. Smart?
—She cut herself while she ________ lunch.
A.prepares B.is preparing C.was preparing
The twins are so alike that even their father finds________ hard to tell them from each other.
A.it B.him C.them
