．People have planted a lot of trees and grass in order to ____ wind and sand in the desert．
| A．hold down | B．hold up | C．hold back | D．hold out |
We should consider the students’ request _____ the school library provide more books on popular science.
| A．that | B．when | C．which | D．what |
Working hard is not only a _____ of great success, but it is among the essential requirement.
| A．sign | B．singal | C．guarantee | D．expectation |
We were strongly recommended that we _____ in Malaysia.
| A．didn’t travel | B．wouldn’t travel | C．hadn’t travelled | D．not travel |
_____ in Harvard is _____ most students wish for.
| A．Being educated; what | B．To educate; that |
| C．Eduacted; which | D．Educating; everything |
He didn’t _____ to what I said because his mind was on something else.
| A．hold on | B．take in | C．catch on | D．get over |