1£®I can't say which wine is best—it's a matter of personal taste.

2£®The message is very urgent£¬so it is supposed to_be_sent (send) as soon as possible.

3£®Suppose/Supposing (suppose) we can't solve the problem£¬what shall we do next?

4£®He spoke in support of the plan£¬which made me very happy.

5£®I am bored (bore) with this job£¬doing the same thing all day long.