It was ________ that the PLA men got to the earth-strike area.
Take a taxi , ______ you'll miss your train .
--- I ______ so busily recently that I ______ no time to help you with your math. --- That’s OK. I can manage it by myself.
--- Oh, dear. I forgot the air tickets. --- You ______ something.
Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes to classroom tests.
By the time you arrive home, I ____, so please don’t make any noise when you come in.