He was puzzled by this phenomenon. He began to try every approach _________ the best way of working it out.
I think my friend Tony is ______ to win the tennis game next Monday.
Fresh air, enough exercise and nutritious food ______ to sound health.
I sent for a technician ______ John isn’t familiar ______ the computer software they use?
--- What’s the time?--- Oh, I forgot to have my watch ______.
The radiation amount of a mobile phone for two half-hour periods per day is equal to ______ to an X-ray for ten seconds.