Mr. Li, let’s go fishing this weekend with Lao Wang, shall we?—I’d love to, but nobody knows if he _______ free then.

_____can work out the problems because _____of the problems is easy.

_______your brother like _______ fishing? –Yes, of course.

Would your parents like to go to Taiwan for a vacation with you? —They’d love to, but ______of them has enough time .

Lin saw __________ UFO last month. It’s strange.