4. Điềnmộtgiớitừthíchhợpvàomỗichỗtrốngtrongcáccâusau.
a. My aunt sliced the beef (41)...............................thin strips.
b. Those books at the back of the library are (42)............................... English.
c. Mr. Minh is not at home now. He is (43)...............................work.
d. My school library closes (44) ............................... half (45) ............................... four.