Even in clear weather one is wise to_________.A.l

One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to _______.

No one is allowed （smoke) ________ in public buildings according to the new regulations.

As it is a very popular play, it would be wise to ___ seats in advance.A.buyB.preserveC.bo

______ is an indication that the weather is about to clear.A.rising cloudsB.lowering cloud

The newspaper says that the weather is going to_________tomorrow. A. clear of B. clear

Your explanation is clear and______.A．to the pointB．at the pointC．a case in pointD．on the