We’ve asked our neighbors to ________ the house when we are away on vacation.
Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.
— But for your timely warning, we _____ into great trouble.— Well, you know we’re friends.
I would appreciate ______ you could give me some advice on TOFEL test.
________ doing his experiment, he forgot to pick up his wife from the station.
Only then did I realize that it was foolish to ___ my friends and never contact them.