The best method to _____ the goal of helpingthe patients with AIDS is to unite as many sympathetic people as possible

If you can’t decide which of the two novels to borrow, why not take _____ I won’t read them this month.

What happened _______ the passengers on the Flight MH 730 on March 8

The foreigners find _____difficult to learn Chinese well.

Look, so many young men ___________with their mobile phones on the underground.