I’m not sure whether this is the book ______ my brother read the year before last.

Do you like zongzi —Yes, it’s ______ Chinese food.

Sam someknowledge of the computer just by watching others working on it

Two years ago, Lucy was weak _____ English, but now he is good ______ it.

______ in the queue for half an hour, the old man suddenly realized he had left the check in the car.