Before a problem can be solved，it must be obvious____the problem itself is.
| A．what | B．that | C．which | D．why |
116. His voice was ____ out by the traffic.
| A．lost | B．drowned | C．appeared | D．Disappeared |
114. Never _____ a conclusion without investigation.
| A．come to | B．reach for | C．arrive in | D．Draw |
113. He, out of breath _____ himself along the street. Perhaps he was badly ill.
| A．drew | B．pulled | C．dragged | D．Pushed |
112. His mother was ill yesterday, so he had to _____ a doctor.
| A．called in | B．looked after | C．come in | D．see off |
111. Morning exercises will ____ good to your health. You should keep early to bed and early to rise.
| A．do | B．make | C．become | D．Have |