I really don’t know if she_____ it when she_____.
--Did you see Mary and her sister this morning?-- Yes, I saw _________ girls playing in the playground.
Although advertisements enable _________ to make decisions quickly, they sometimes cause lots of trouble.
Over 20 countries joined to search _________ Flight MH370 in the southern Indian Ocean.
Nowadays many parents make their children study various subjects _________ weekends.
New Year’s Eve is always _________ noisiest night throughout China.