There is long way to go for scientists to study _____space.
| A．a | B．an | C．the | D．/ |
David talked with a friend of ____ on the Internet for a long time yesterday.
| A．he | B．his | C．him | D．himself |
--- The windows are broken and need to be repaired.
--- I think so. They can hardly _____ the cold now.
| A．keep out | B．give out | C．take out | D．put out |
On holidays, they prefer to _____ at home rather than _____.
| A．staying, going hiking | B．stay, going hiking |
| C．stay, go hiking | D．staying, go hiking |
The old should _____ well.
| A．be take care of | B．look after | C．be looked after | D．be taking care of |
--- Sorry, I’m late.
--- It doesn’t matter. The meeting _____ just for several minutes.
| A．has begun | B．has started | C．has been on | D．started |