1.People all believe United Nations has been promoting international trade all the time.
A. the; / B. the; the C. /; the D. /;/
2. The thought of going back home was kept him happy while he was working abroad.
A. that B. all that C. all what D. which
3. The number of the guests invited thirty, but a number of them absent for different reasons.
A. were; was B. was; were C. was; was D. were; were
