A：Where is your cat? B：My cat is in the _____ .
A. classroom B. box C. office
It is August the _______ today.
A.twentyB.twentyth C.twentieth
Can I speak _____Yao Ming, please?
A.toB.withC.at
The tree _________ are green in spring.
A.leafsB.leavesC.leaf
They _______ the insects carefully.
A.watching B.are watchingC.is watching
---When do you watch TV?
---I usually watch TV ______ seven o’clock.
A.inB.onC.at