—What has made John look like lacking sleep?—________ he had to prepare for the coming exam and stayed up last night.
He is known _____ his being on time, so we don’t know the reason ____ his being late this time.
________ English will help to communicate _____ people from different countries in the world.
You should try to get a good night’s sleep ____ much work you have to do.
. We’d better start off a little earlier, or we may ____ in the traffic congestion.
I decide to pay a visit to you, but I don’t know whether it is quite _________ to you.