21．He expressed his gratitude to his head teacher, without help he wouldn’t have made such great progress in his studies.
A．whose B．his C．whom D．which
22．--- Sorry, Daddy. I am not getting on well with my studies.
--- Well. You hadn’t wasted so much time playing online games.
A．As if B．Even if C．If only D．Only if
23．He has made up his mind to his dream no matter what difficulties he may run into.
A．hug B．realize C．reach D．touch
24．Since my return to China, I haven’t seen my host mother in America; nor from her.
A．I heard B．I have heard C．did I hear D．have I heard
