Try not to cough more than you can _______ since it may cause problems to your lungs.
| A．check | B．allow | C．stop | D．help |
Until the present century, ________ demand for natural gas.
| A．little | B．and little | C．there was little | D．was there little |
By the end of this year, we _____ 2000 English words.
| A．will learn | B．would learn |
| C．have learned | D．will have learned |
_______ knows the truth will tell you about it , I think .
| A．Who | B．No matter who | C．Whoever | D．B and C |
The head engineer is in ________ the project .
| A．his charge of | B．the charge of | C．charge of | D．one’s charge |
______ began our new lesson.
| A．But | B．Such | C．Thus | D．So that |